oil;

Oil is a liquid fat that remains fluid at room temperature, derived from animal, plant, or mineral sources. In culinary contexts, oils are primarily extracted from seeds, nuts, fruits, and legumes through mechanical pressing, solvent extraction, or infusion methods. Common culinary oils include olive oil (from olives), vegetable oils (from soybean, canola, sunflower), nut oils (walnut, almond), seed oils (sesame, flaxseed), and tropical oils (coconut, palm). Each oil possesses distinct flavor profiles, smoke points, and nutritional compositions. Oils may be further refined, virgin, or cold-pressed, affecting their sensory characteristics and stability during cooking.

The chemical composition of oils consists primarily of triglycerides—three fatty acid chains bonded to a glycerol backbone. The specific fatty acid profile (saturated, monounsaturated, polyunsaturated) determines an oil's stability, health properties, and culinary applications. Virgin and extra-virgin oils retain more natural compounds and flavor compounds, while refined oils are neutral and heat-stable.

Oils serve as fundamental cooking mediums for sautéing, frying, roasting, and baking. They function as flavor components in vinaigrettes, marinades, and sauces, with delicate oils (extra-virgin olive, walnut, truffle-infused) reserved for finishing dishes and drizzling. Heavy-duty cooking applications employ neutral, high-smoke-point oils (vegetable, canola, grapeseed), while medium-heat cooking utilizes oils like extra-virgin olive oil. Oils also serve as emulsion bases in mayonnaise and aioli, and as enrichment in baked goods. Different culinary traditions favor particular oils: olive oil dominates Mediterranean cuisine, sesame oil seasons East Asian dishes, and clarified butter (ghee) anchors Indian cooking.