Title: PRINCIPLES OF COOKING
1PRINCIPLES OF COOKING
2Principles of Cooking
- Cooking can be defined as the transfer of energy
from a heat source to a food - Energy alters the foods molecular structure,
changes its texture, flavor, aroma, and
appearance - When food is cooked, the process destroys
microorganisms and makes food easier to ingest
and digest
3Cooking Methods
- Broiling
- Poaching
- Grilling
- Simmering
- Roasting
- Boiling
- Baking
- Steaming
- Sautéing
- Braising
- Pan-frying
- Stewing
- Deep-frying
4Heat Transfer
- Conduction
- Convection
- Natural
- Mechanical
- Radiation
- Infrared cooking
- Microwave cooking
5Heat Patterns
6Effects of Heat
- Proteins coagulate
- Starches gelatinize
- Sugars caramelize
- Water evaporates
- Fats melt
7Cooking Methods
- Dry-heat
- Moist-heat
- Combination
8Dry-Heat Cooking Methods
- Broiling
- Grilling
- Roasting
- Baking
- Sautéing
- Stir-frying
- Pan-frying
- Deep-frying
9Dry Heat Cooking Methods
- DefinitionAny cooking method that does not use
moisture as a cooking medium - Methods
- Roasting
- Sauteing
- Grilling
- Deep-frying
10Deep Frying
11Oils for Deep-frying
- In the past, chefs used rendered beef suet for
deep fat frying. Today, commercially
manufactured shortenings specifically for
deep-frying are recommended. - Most of these shortenings are vegetable based ,
the most popular types are made from soy bean oil
and canola oil.
12Smoke point
- Smoke Point - the temperature at which an oil or
fat visibly begins to smoke and chemically begins
to break down - Canola Oil - smoke point - 425 ?F
- Many commercial fryer shortenings are fully or
partially hydrogenated. Hydrogenation is the
process of adding hydrogen to oil, which makes it
solid (fully hydrogenated) or creamy (partially
hydrogenated) and resistant to oxidation and
chemical breakdown.
13Enemies of Fat
- Fat can be damaged by
- Salt (oxidation)
- Corrosive metals (oxidation)
- Water (hydrolysis)
- Heat (polymerization)
- Burnt Food Particles
14Maintaining Fat
- Store in tightly sealed containers away from
light. Cover fryer when not in use. - Skim food particles during frying.
- Dont salt food over the fryer.
- Food to be fried should be free of excess
moisture. - Dont pre-heat fryer too soon before frying.
Turn off when done frying. The longer fat is
exposed to heat the shorter its life. - Dont mix fats, saturated fats break down more
quickly. - ( dont fry bacon in the deep fryer)
15Deep fryers
- Fuel can be gas or electric
- Fryers are classified by the amount of shortening
they can hold. - Capacities range between 15 - 82
- Temperature Range 200 - 400? F
- Most deep- frying is done between 325 and 375?F
- Most fryers are designed to maintain a ratio of
8 fat to 1 food product being fried. This
ratio is key to a quick recovery time - Recovery time is the length of time it takes for
fat to return to desired cooking temperature
after food is submerged in it. -
16Coating Methods
- à la Francaise - dredged in flour
- à lAnglaise Standard Breading Procedure
Flour ? Egg Wash ? Bread Crumbs - à lOrly - battered (beer batter, tempura, egg
batter) - The purpose of coating or breading food to be
deep fried is twofold - To keep the moisture in the product.
- To keep the fat out of the product.
17Frying Methods
- Basket method - Product is placed in the basket
and lowered into the fat in the basket. - Double basket method- Same as 1., but a second
basket is placed over the the product to keep it
from floating. - Swimming method- product is dropped directly into
the fat and allowed to float freely usually done
with with battered foods that might stick to the
basket
18Grilling and Broiling
19Grilling and Broiling
- Grill - to cook with heat from below
- Broil - to cook with heat from above
- Both utilize very hot - radiant heat, therefore
only tender cuts should be used.
20Grilling and Broiling
- Fuels used
- Broilers and Salamanders - Gas and Electric
- Grills - Electric (closed)
- - Gas with metal heat deflectors
- - Gas with lava rock
- - Charcoal-compressed and natural
- - Wood-hard woods
21Grilling Procedures
- 1. Preheat the grill.
- 2. Clean the grill with a wire brush.
- 3. Brush item to be grilled with oil or clarified
butter. Season product. - 4. Place the item on a hot area of the grill.
Allow grill marks to form. - 5. Turn the product 90 and allow cross marks to
form.
22Grilling Procedures
- 6. Flip the product and finish cooking over
moderate heat. After searing the second side
larger or pieces to be more well done may be
finished in the oven. -
- Some fish and other delicate products may be
seared on only one side and then finished in the
oven.
23Grilling Fish
- - The most important consideration in factor in
grilling fish is the texture of the product to be
grilled. - - Firm fleshed fish with an adequate oil content
are best - Salmon Swordfish Tuna
- Sturgeon Mahi Mahi Redfish
- Shark Halibut Wahoo
- Grouper Catfish
24Grilling Fish
- - Fish filets or steaks are most commonly grilled
- - Smaller whole dressed fish may also be grilled
- Mackerel Sardines Sole
- Snapper Sea bass
- - Shellfish and crustaceans can also be grilled
- Lobster Shrimp Sea Scallops
- Abalone Octopus
25Broiling Fish
- Any fish regardless of texture can be broiled
-
- 1. Place fish filet on a buttered sizzle plate
- 2. Season and brush with butter
- 3. Cook under broiler until filet is flaky.
-
- - Generally oilier fish hold up best in the dry
heat of the broiling process.
26Roasting
27Roasting
- Dry heat method of cooking - use tender cuts
- - Method of heat transfer - convection
-
28Roasting
- Two Methods
- A. Searing method - Red meats are seared first to
seal in the juices and give color by means of - 1. Browning in a small amount of fat on top of
the stove - 2. Starting the roast at a high temp. (450-500)
in the oven then finished at lower temperature. -
- Advantage - meat is well caramelized - good
appearance - Disadvantage - higher shrinkage - less yield
29Roasting
- B. Low temperature or constant heat method
- - Meat is cooked at a moderate temperature
throughout - Advantage - Better yield - less shrinkage
- Disadvantage - Longer cooking time
caramelization may not be as pronounced
30Roasting
- Determining Doneness
- A. Touch - experience needed
- B. Time / Weight / Temperature
- C. Insert a metal skewer
- 1. Temperature of skewer (vs. body
temperature) - 2. Observing the color of juice that flows out
- D. Thermometer
31Roasting
- Carry-over Cooking - the cooking that occurs
after a food has been removed from the heat
source. It is accomplished by the residual heat
remaining in the food. -
- In roasting, the larger the piece of meat, the
more heat energy it holds. Therefore the larger
the piece of meat the more carry-over cooking
will take place. Carry-over cooking can account
for as much as 20F.
32Roasting
- Resting - after removing them from the oven,
roasted meats should be allowed to rest 20 min.
before carving to - 1. Finish carry-over cooking
- 2. Allow meat fibers to relax. Juice will flow
back to outer tissue from the center of the
roast. - Meat carved too soon will lose its color,
moisture and flavor and will appear to be
overcooked.
33Roasting
- Pan Gravies
- Principle - to dissolve drippings left in
roasting pan (fond) to make a sauce - A. Apply low heat to roasting pan to clarify fat.
Meat drippings that are suspended in the fat
will cling to the bottom of the pan. - B. Fat is removed from the pan or degreased
- C. Deglaze roasting pan with stock to prepare
- 1. Jus clair (natural juice, au jus)
- 2. Jus lié - jus clair thickened with cornstarch
or arrow root - 3. Gravy - jus clair thickened with roux
(degreased fat from the roast is sometimes used
to make the roux)
34Sautéing Sauté (Fr. ) - to jump
35Sautéing Proteins
- The key to sautéing proteins is to sear the meat
to create color and preserve moisture. - Procedure
- Hot pan, small amount of fat (just enough to coat
the bottom of the pan. - White meats are dredged in flour, dark meats are
not. - Only use tender cuts of meat
- Cooked to order, not held
36Sautéing Proteins
- Deglazing
- Excess fat is removed from the pan
- Liquid is added to the pan
- The liquid washes the deglazed drippings
(fonds) which are then used to make a sauce.
37The 1 problem in sautéing is moisture.
- If moisture is allowed to accumulate, meat will
boil and toughen. - Remedies to avoid excess moisture
- Heat pan and fat before adding meat.
- Make sure meat is dry.
- Dont overload the pan.
- Once meat is added to a hot pan, do not stir or
shake until heat is recovered. - If sauce is made from the deglazing, the meat may
be added back to the pan to mix it, but do not
return it to a boil or the meat will toughen and
lose moisture.
38Stir-frying
- Always high heat
- Use a wok or sauteuse
- Product is always cut in small pieces
- Used for either cooking or finishing
39Stir-frying
- Some products in the stir-fry may be pre-cooked
partially or fully as the situation requires. - Most of the concerns that apply to sauté also
apply to stir fry.
40Pan-Frying
- Larger or portion size pieces are used in pan
frying (chops, steaks, filets etc.) - Use enough fat to cover the product by half.
- Food does not jump.
41Pan-Frying
- Items are cooked for a longer time than sautéed
items, in some cases they are finished in the
oven. - Usually there are no drippings in the pan to make
a sauce.
42 Fat Considerations when Sautéing
- The fat used in frying and sautéing plays a
large part in determining the quality of the
finished product. - Smoke pointThe temperature at which a fat
breaks down and begins to smoke. Smoke point is
mainly determined by the amount of free fatty
acids in the fat. - As a rule, Animal fats are high in F.F.A. and
vegetable fats are low in F.F.A.s.
43 Smoking Point of Fats Source Escoffier-Le
Guide Culinaire
- Whole butter 250 F
- Clarified butter 270-280 F
- Animal fats 290 - 320F
- Lard 400F
- Goose Fat - 430F
- Coconut oil - 480F
- Vegetable oil - 520F
- Olive oil - 550F
44Determining Doneness for Red MeatsTerm
Appearance TemperatureBlue-Center is red and
cool Less than 140(extra rare)Rare-Center is
red and warm 140F Medium rare-Center is
red-pink hot 150F Medium-Center is pink
hot 155-160 F Medium well-Center is slightly
pink 165 F Well done- Center is brown 170 F
45Determining Doneness for Red Meats
- When cooking red meats using dry heat cooking
methods, they should never be poked or broken to
check doneness. This will cause a considerable
amount of color and moisture to be lost. - With practice, touch is used to determine
doneness of protein. The firmer the protein is
to the touch, the more well done it is.
46Moist Heat Methods of Cooking
- Poaching
- Simmering
- Boiling/Blanching
- Steaming
47Moist Heat Methods of Cooking
- Used for a wide range of products (vegetables,
meats, eggs, fish) - Used to both tenderize tough pieces of meat and
gently cook delicate fish and vegetables.
48Poaching 160 - 185F (71 -82C)
- to gently cook in a flavored liquid
- relatively low temperature applied to tender or
delicate products - Eggs
- Fish
- Young Poultry
49Poaching
- Shallow poaching - small pieces of meat fish or
poultry cooked in very little liquid. The
poaching liquid is usually used to make a sauce
for the finished product. - Deep poaching - for large pieces, liquid to
cover. A court bouillon is commonly used for
deep poaching. - Court Bouillon Water Acid (to coagulate
proteins) Aromats
50Simmering 185 - 205F (85 -96C)
- Often mistakenly called boiling
- As water is a much better conductor of heat than
air, moist heat cooking is generally applied to
tougher cuts of meat. Moist heat is very
effective in breaking down connective tissue - Used for meats that require wet methods
- Broth is sometimes used for soups or sauces
Examples Pot au Feu or Chicken Dumplings
51Boiling / Blanching - 212F (100C)
- Cooking quickly in rapidly boiling liquid for the
purpose of - Par-cooking (vegetables)
- Removing impurities (offal meats and bones)
- Removing bitterness from vegetables (greens and
cabbage)
52Steaming above 212F (100 C)
- The act of using steam, not water vapor, as a
heat transfer agent. - Three types
- High pressure
- Low pressure
- No Pressure
- Adding pressure accelerates the cooking process
53Steaming
- Due to the fact that high heat toughens proteins,
this method is rarely used with meats. - Steam is best for
- Shellfish
- Starches (rice and potatoes)
- Vegetables (except fresh green)
- Certain reheating operations
54Steaming
- High pressure usually 10 15
- Good for cooking vegetables fast esp. frozen
- Good for fast cooking of meats that require wet
methods - Low pressure usually about 5
- For every 1 of pressure you gain about 3F
- No Pressure steaming does not work well for green
vegetables.
55Combination Cooking Methods
56Marinades
- Two types of marinades
- Oil based - used for tender cuts and dry cooking
methods. - Acid based - used for tough cuts. Acid helps to
break down collagen. - Vacuum tumbling marinading - meat products and
marinade ingredients are tumbled in a vacuum
drum. Absence of air means greater penetration
of the marinade and less time marinating.
57Ideal Items to be Braised
- Typically tough pieces of meat that require long,
slow cooking. - Collagen-rich meats contribute gelatin.
- Examples shoulder, leg, breast, and shank cuts.
58Larding
- To insert strips of fat into a piece of meat with
a special needle. These strips of fat, called
lardons, are usually salt pork, slab bacon,
pancetta or fat back. The lardons may be
marinated before larding and are inserted with
the grain of the meat.
59Combination Cooking
- Braising and some stewing of meats are considered
combination cooking methods because they employ
both dry and moist heat - Dry heat to sear the meat (sealing in the juices)
- The addition of liquid to continue the cooking
process (simmering) and break down connective
tissue.
60Braising
- Braising can be done with
- large pieces (Pot Roast
- portion size pieces (Swiss Steak)
- small pieces (stews)
61Procedure for Braising
- Meat must be seared by browning it at high heat
in a small amount of fat. - After searing mirepoix is added and placed on the
bottom of the pan - meat is placed on top.
- Red meats - mirepoix is browned
- White meat - mirepoix is sweated
62Procedure for Braising
- Tomato product is added (red meats only) Usually
meat is seared in the pan it is to be braised in,
if not the pan should be deglazed. - Liquid is added - stock, wine, marinade, beer,
light sauce , or water. The amount of liquid
added is in direct relation to the amount of
sauce needed for the finished product.
Recommended ratio is to cover the meat by 1/3 to
2/3.
63Procedure for Braising
- Herbs and spices are added.
- Pan is brought to a simmer. A lid is placed on
it and it is placed in the oven. - Meat should be turned or basted occasionally
during the braising process to produce a nice
glaze. - Test for doneness fork tender insert a meat
fork, if it pulls off easily the meat is done.
64Procedure for Braising
- After the meat is done, a sauce can be made from
the degreased cooking liquid (cuisson). - - Served as is
- - Reduced to thicken and/or intensify flavor
- -Thickened with corn starch or with roux to
make a sauce (jus lié) -
65White Braising
- Different from standard braising in that the
items are either lightly colored (seared) or not
colored at all. - Done with some poultry items and occasionally
with large pieces of fish.
66Stewing
- Stew - a liquid food containing meat, poultry,
fish or vegetables or any combination. - Stewing is a moist cooking method carried out
with smaller cuts of meat by - - Braising
- - Simmering
67Stewing
- Stews can be divided into two classifications
- Brown stews (red meats)
- White stews (white meats)
- Blanquettes
- Fricassees
68Stews
- Ragout - a general term referring to white or
brown stews. - Fricassee - a white ragout usually made from
white meat or small game, seared without browning
and garnished with small onions and mushrooms. - Chili (con carne) - a ragout of diced or ground
meat, cooked with chilies, onions and spices.
Served with beans in the stew or on the side.
69Stews
- Navarin - a brown ragout generally made with
lamb, turnips, peas, onions and other root
vegetables - Blanquette - a white stew in which the meat is
first blanched, then added to a stock or sauce to
complete cooking. Blanquettes are finished with
an egg and cream liaison. - Goulash/paprikash - a Hungarian stew made with
red meat, onions and paprika.
70Principles of Vegetable Cookery
- Why are vegetables cooked?
- To break down cellular structure or make them
more digestible - To make them more palatable
71Cellulose
- Microscopic fibrils of cellulose form the cell
walls of plants and make plant tissue rigid.
They are invulnerable to human digestive enzymes.
The amount of cellulose in vegetables helps
determine the cooking time and method. - For example spinach cooks much faster than
carrots.
72Chemistry of Cooking Vegetables
- Colors change by cooking method and chemical
reactions. Since most vegetables are cooked in
water, the condition of the water or pH
(Acidity / Alkalinity) is responsible for these
changes. - Alkali medium for cooking vegetables should be
salted water. Stronger alkali such as baking
soda break down the vegetables texture too
quickly. Never use ammonia. - Acid media include water with the addition of
lemon juice, vinegar, wine, or milk
73Chemistry of Cooking Vegetables
- Covered or Uncovered ?
- Vegetables are naturally acidic and their acids
are released during cooking. - These volatile acids evaporate in the steam of
the boiling water. Therefore, if an acid medium
is required cook covered. If an alkali medium is
required, cook uncovered.
74Cooking Vegetables by Color
Green Vegetables
- Green vegetables get their pigment from
chlorophyll. Acid and heat will destroy
chlorophyll rapidly, making it yellow or brown.
They should be cooked in large amounts of salted
water uncovered, as quickly as possible .
75Cooking Vegetables by Color
White Vegetables
- White vegetables get their pigment from flavones
that are water soluble. When cooked in highly
alkaline water they turn yellow. To prevent this
add acid and cook covered.
76Cooking Vegetables by Color
Red Vegetables
- Red vegetables owe their pigment to anthocyanins.
Red color is enhanced with the addition of an
acid. If cooked in a highly alkali medium they
can turn blue! -
77Cooking Vegetables by Color
Orange / Yellow Vegetables
- Orange / Yellow vegetables get their color from
carotenes. The condition of the water has little
effect on these pigments which are not water
soluble, but can be released by sweating or
sauteeing.
78Procedure for Blanching Vegetables
- Wash, peel, trim and cut the vegetables into
uniform shapes and sizes. - Bring an adequate amount of liquid to a boil.
The liquid should cover the vegetables and they
should be able to move freely. - Add vegetables to the boiling liquid. Vegetables
with different cooking times or colors should be
cooked separately.
79Procedure for Blanching Vegetables
- Cook vegetables to desired doneness.
- Drain vegetables from boiling water.
- Refresh or shock vegetables in ice water to stop
the cooking process. Drain and reserve until
needed.
80Finishing Vegetables
- Blanched vegetables may be finished (notenot all
vegetables need be blanched) - Sautéed in butter
- In a sauce
- Au gratin
- Mashed or pureed
- Served cold
- Deep fried
81 Other Methods of Cooking Vegetables
- Braising
- Glazing
- Steaming
- Stewing
- Sautéing / Stir-frying
- Pan Frying / Deep Frying
- Baking / Roasting
- Grilling / Broiling
82Determining Doneness
- Avoid over cooking vegetables. The term al
dente or firm to the bite is often used to
describe proper doneness. Generally vegetables
are done when they are tender when pierced with a
fork or the tip of a paring knife. Properly
cooked vegetables are not crunchy.
83Preserving Nutrients in Vegetables
- Use vegetables that are as fresh as possible.
- Store in a cool place with minimum exposure to
light. - Wash vegetables whole, before cutting, as near to
cooking time as possible.
84Preserving Nutrients in Vegetables
- Peel and cut as near to cooking time as possible.
Some nutrients are destroyed by oxygen and light. - Cook as quickly as possible.
- Drain vegetables when cooked. Avoid storing them
in liquid. Water soluble B and C vitamins are
especially vulnerable. - Serve as soon as possible
85Starches and Grains
86PotatoesOrigins
- Potatoes are native to the Andes Mountains of
Peru. They were first brought to Spain in the
early 1500s. Its use spread throughout Europe,
but wasnt a common food source in Europe until
the 1700s. -
87PotatoesOrigins
- Antoine Parmentier (1737-1817)
- wrote numerous works proving the potato was a
safe and nutritious food source to the French who
scorned it before his time. Therefore, the
classic name for an item garnished with potatoes
is Parmentier.
88PotatoesComposition
- 80 Water
- 18 Starch Sugar (Carbohydrates)
- 2 Protein
89PotatoesCategories
- Mealy (starchy ) - high starch content and thick
skin. Best for baking and often referred to as
bakers. Low sugar content makes them good
for deep frying, giving a crisp texture and even
color. - Waxy - low starch content, usually with more
sugar and a thin skin. Best for boiling. They
do not become fluffy when baked, and tend to
become streaky (caramelized sugar ) when deep
fried.
90PotatoesCategories
- Mealy
- Russet
- Idaho
- White rose
- Burbank
- Waxy
- Cobbler
- Red
- Maine
- Yellow Fin
91PotatoesCooking Methods
- Boiling
- in the skin - jacket potatoes
- peeled
- in stock or bouillon - pommes fondant
- Pureed
- boiled first, drain completely, puree while still
hot - Mashed or whipped - addition of milk, cream or
butter - Duchess (doo SHEHS) - add yolks and pipe
92PotatoesCooking Methods
- Deep fried
- From a pureed appariel (ah pahr AY)
- Croquette (kroh KEHT)-shaped, breaded ,
deep-fried - Dauphine (doe FEEN)-appariel with pate au choux
- Lorette (lohr EHT)- dauphine with grated cheese)
- From raw
- Pommes frits (pohm FREET) - French fries
- Pont neuf (pohnt NOOF) - Steak fries
- Pomme paille (pohm PIE) - Shoe string
- Cottage fries -rondelle cut
93PotatoesCooking Methods
- Pan - fried
- Hash browns cooked or raw, chopped or shredded
- Home fried -par-cooked rondelles
- Lyonnaise -home fried with onions
- Potato pancakes (shredded raw)
- Rissolé --- tournéed, various sizes
- Parisienne
- Château
- Cocotte
94RiceCategories
- Categorized by seed size
- long grain
- medium grain
- short grain
95RiceCategories
- Categorized by processing
- Brown rice
- Bran intact
- White rice
- endosperm pearled or polished
- Converted rice
- par-boiled to remove surface starch (most
popular in foodservice) - Instant
- fully cooked and freeze dried
- Categorized by seed size
- long grain
- 6 mm. long
- medium grain
- 5-6 mm. long
- short grain
- 2.5 mm. long
96Rice Varieties
- Arborio - medium grain starchy rice for risotto
- Basmati - rich flavorful long grain rice used in
East Indian Cuisine - Pecan rice - nutty flavored rice from South
Louisiana - Wild rice - Actually an aquatic grass originally
harvest by Native Americans in Minnesota and
Wisconsin
97Grains
- Corn
- Cornmeal, hominy, grits, masa harina
- Wheat
- Wheat berries, bulgar, semolina, cous cous
- Barley
- Buckwheat / Kasha / Groats
- Oats
- Exotic Grains
- Quinoa
- Millet
- Amaranth
- Kamut
98Cooking Rice Grains
- SIMMERING METHOD
- (3 parts liquid to 1 part rice by volume)
- Bring liquid to a boil.
- Stir in grains and seasoning.
- Return to a boil. reduce to a simmer and cover.
- Simmer until grains are tender and liquid is
absorbed. - Remove from heat
- Drain if necessary. Keep covered and allow excess
liquid to absorb. Fluff.
99Cooking Rice Grains
- II. PILAF METHOD
- (2 parts liquid to 1 part rice by volume)
- Heat fat in sauce pan, sweat aromats (onion,
garlic, mirepoix etc.) - Add rice and stir to coat grains with fat.
- Add liquid (usually seasoned stock).
- Bring to a simmer.
- Cover and place in oven (350 for 20 30 min.).
- When liquid is absorbed and grains are tender,
uncover and fluff.
100Cooking Rice Grains
- III. RISOTTO METHOD
- ( 3 parts liquid or more to 1 part rice by
volume) - Bring cooking liquid to a simmer.
- Heat fat in sauce pan, sweat aromats (onion,
garlic, other ingredients). - Add rice and stir to coat grains with fat.
- Add a small amount of hot liquid , stirring
continually until absorbed. - Repeat step 4 until all liquid is absorbed and
grains are tender. - Finish with whole butter and parmesan cheese.
101Cooking Pasta
- PROPER RATIO
- 1 gal. rapidly boiling water to 1 pasta
- DRY PASTA
- Requires a longer cooking time as cooking is also
rehydration. - 1 dried pasta 2-3 cooked
- 2 oz. dry pasta is an average entree portion
- FRESH PASTA
- Delicate, requires a very short cooking time no
re-hydration required
102Cooking Pasta
- Bring salted water to a boil (1 gallon per 1
pasta) - Add pasta and stir to separate pieces
- Cook pasta uncovered at a rolling boil until al
dente - Drain pasta immediately and serve at once or
shock in ice water to stop the cooking. - To hold cooked pasta, toss with oil.