c walnuts

Walnuts are the edible seeds of the Juglans regia tree, native to Central Asia and the Caucasus region but now cultivated widely across temperate climates. The nut is enclosed in a hard, wrinkled shell and contains a brain-like kernel with two lobes, characterized by a slightly bitter, earthy flavor with subtle sweetness. The most common culinary variety is the English walnut (also called Persian walnut), though black walnuts (Juglans nigra), native to North America, possess a more assertive, tannic flavor and are less commonly used in cooking.

Walnuts are employed across global cuisines both as a textural element and as a source of rich, nutty flavor. They appear in savory dishes such as walnut-crusted meats, salads, and Middle Eastern vegetable preparations; in sweet applications including baked goods, desserts, and nut butters; and as garnishes for soups and grain dishes. Ground walnuts function as thickening agents in sauces and braises, particularly in Persian and Caucasian cuisines. Toasting walnuts before use intensifies their flavor, while their high oil content makes them valuable for nut oils and butters.