I thought I would share my outline for a lecture I gave to a group of cooks at the local hospital. It is easy to forget the wide variety of fats and oils we have available for cooking. I thought you might like to know.
Tastefully yours®
Chef Michael Hutching
Fats and Oils in Cooking
Liquid and solid fats as flavor enhancers.
Fats absorb and transfer flavors to food.
Fat give sustained feeling of being full.
Fats come from animal sources like lard, butter and shortening and from grains, seeds and nuts
First consideration is are they saturated, monounsaturated or poly saturated fats.
Saturated fats, mostly from animal products, should be eaten in moderation.
Trans fats, Trans fat is the common name for a type of unsaturated fat with trans-isomer fatty acid(s). Trans fats may be monounsaturated or polyunsaturated but never saturated. Hydrogenation is the main culprit.
Monounsaturated are considered best for cholesterol control.
The next consideration is what sort of taste and texture that fat or oil contributes to the cooking. Butter defines the cooking of France and olive oil defines Mediterranean cooking.
Measuring fats in bulk can be done by using water. For example, for 1/2 cup of fat, fill a measuring cup with 1/2 cup water then add fat until you see the 1 cup mark.
If you use oil instead of butter use about 80% to account for the milk solids and water in whole butter.
All fats and oils have about 9 calories per gram or 270 per ounce.
Oils can be classified in several way
Basic cooking oils such as soy, cottonseed, peanut, canola, corn or blends, olive oil.
Oils designed for deep fryers that withstand high heat
Specialty oils such as walnut, hazelnut, pumpkin, sesame, pistachio.
Most flavorful oils are cold pressed like an extra virgin olive oil. It has more natural flavor and is more expensive.
Some oils are hot or steam extracted and some are event removed with solvents.
After cold pressed, the best quality comes from unrefined oils which are extracted with heat. This is the so called virgin olive oil. Other oils such as peanut, soybean, rapeseed, sesame and coconut come this way. The advantage is more flavor.
These types of oils should be keep in cool, dark places and used soon after purchasing. They should be refrigerated if not in use. They do not work for deep-frying. Do not use these oils if they small fishy, cheesy or musty.
Most oils commercially made have been refined and lack real flavor because the are neutralized, de-colored and deodorized for stability.
General rules is to avoid getting any oil to the point where it starts to smoke, this means the oil is breaking down. Monounsaturated rated fats like sunflower, peanut and canola have the highest smoking point.
Oil Types
Vegetable seeds
Avocado, Corn, canola (Canadian oil, low acid) type of rapeseed, ADD EVO at end of cooking for flavor, grape, safflower high smoke points, sesame seed-perfumed oil-toasted or not toasted, cottonseed-highly saturated fat, poppy seed oil, mustard seed, pumpkin seed.
Legume and nut oils.
Peanut-quality varies-little flavor.
Almond, walnut, hazelnut, macadamia nuts, pistachio-fragile and rancid quickly and low smoke points-best for dressings or added at last minute.
Olive oil.
Best-fruit crushed, put in hydraulic press and extracted, Use in one year.
Extra Virgin Olive oil- Best, Fine Virgin pressed no heat or solvents-cooking & dressings, Olive Oil-refined with solvents or chemicals-sometimes blended, Light Olive Oil-refines-no flavor or color-waste of time, Pumace olive oil-paste heated and cooked out-poor choice.
Butter
Butter-80-82% milk fat-16% water, 1-1/2% milk solids, 2% salt
Clarified, Ghee-cooked-slightly nutty flavor, cultured butter-like buttermilk with slight lactic acid tartness
Truffle Oil Scam
Select oil for affect on cooking, flavor, health and cost. No sense using and EVO to sauté foods.
Specialty oils used for flavor, add after cooking or in dressings.
Truffle oil-Truffle oil is a modern culinary ingredient added to foods, which is intended to impart the flavor and aroma of truffles to a dish. Most truffle oils are not, in fact, made from actual truffles, but are instead a synthetic product that combines a thioether (2,4-dithiapentane), one of numerous organic aromatics odorants found in real truffles, with an olive oil base. A few more expensive oils are alleged to be made from truffles or the byproducts of truffle harvesting and production, though the flavor of truffles is difficult to capture in an oil.
Oil Processing Levels
Refinement Level - Oils are generally grouped into two camps: unrefined and refined. Oil flavor intensity is generally inversely proportional to processing. The first step in producing any oil is removing it from its fruit, nut, seed or grain source. All oil extraction processes involve heating the oil in some way. However, temperatures over 300°F destroy the proteins and natural vitamin E in oils. Lower temperatures (in the 120°F to 160°F range) do not damage the oil significantly, but do reduce the yield, making good oils a little more expensive. It is essential to retain vitamin E in an oil because it prevents the oil from oxidizing. Oils with little vitamin E tend to go rancid quickly unless treated with antioxidant chemicals.
• Expeller-Pressed: These oils are obtained by squeezing the seed, grain, or fruit at pressures up to 15 tons per square inch. The higher the pressure, the more heat is generated. At extremely high pressures, the temperature can exceed 300°F.Most oils are extracted by expeller pressing and don't qualify as cold-pressed because friction heats them above 120°F. Still, unrefined expeller-pressed oils retain most of their flavor, aroma, color and nutrients.
Cold-Pressed: The term cold pressed theoretically means that an oil is expeller-pressed at low temperatures. However the term has no legal definition and is absolutely meaningless when used as an indication of quality. Olive oil, sesame oil, and peanut oil are really the only kinds that can be truly cold-pressed on any sort of large commercial scale. Olive oil is still extracted by the centuries-old process of stone-pressing, though these days it's usually done with hydraulic presses. Both techniques generate little heat, hence the term cold-pressed. They are the only substances that will easily yield their oil by simple, low-intensity pressure, which does not generate a great deal of heat. .True cold-pressed oils are prized. They contain minerals, phosphatides, and vitamin E and are high in trace nutrients.
Extracted: Extracted oils are invariably subjected to some sort of applied heat during processing.
Chemical or Solvent Extraction: The cheaper brands of oil (most regular commercial brands) generally use chemical solvents to extract the oil. A description of how the majority of oils are processed, or refined, is sobering. The oil is separated from its food source with hexane or other petroleum solvents and then boiled to drive off the toxic solvents. The oil is next refined, bleached, and deodorized, which involves heating it to over 400°F. The oil extracted this way still contains some undesirable solvent residues, while the amounts of many key nutrients (especially vitamin E) are significantly reduced. Antioxidants or preservatives such as BHA (butylated hydroxyanisole) or BHT (butylated hydroxytoluene) are then frequently added. The resulting product lacks flavor, aroma, pigments, and nutrients. All that can be said for such an oil is that it has an extended shelf life, a clear, uniform color, and an oily texture.
Reference Wikipedia