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Nuts are the hard-shelled fruit of various woody plants belonging to different botanical families, each consisting of a kernel surrounded by a protective shell. Common culinary nuts include almonds (Prunus dulcis), walnuts (Juglans regia), hazelnuts (Corylus avellana), pecans (Carya illinoinensis), and macadamia nuts (Macadamia integrifolia), among others. Despite their botanical diversity, nuts are nutritionally and culinarily grouped together due to their high fat, protein, and mineral content. The flavor profiles range from mild and buttery (macadamia) to assertive and earthy (walnuts), and their texture varies from delicate to dense depending on variety and preparation.

Nuts have been cultivated and foraged for millennia across temperate and subtropical regions worldwide, serving as staple foods in many cultures. Each variety possesses distinct characteristics: almonds are versatile and sweet, walnuts have a distinctive tannic quality, hazelnuts offer a subtle sweetness, and pecans provide rich caramel notes. The composition and flavor of nuts can be enhanced through roasting, which develops deeper, more complex flavor compounds through the Maillard reaction.

Nuts are used across global cuisines in both sweet and savory applications. They function as standalone snacks, ingredients in baked goods (cookies, cakes, breads), components in sauces and pastes (nut butters, romesco, muhammara), and toppings for salads, desserts, and grain dishes. In Asian cuisines, nuts appear in curries, stir-fries, and noodle dishes; in European traditions, they feature prominently in confections, pralines, and pastries. Nuts can be blanched, sliced, chopped, ground into flours or butters, or pressed for oils. Roasting intensifies flavor and is essential for achieving optimal taste in many applications. Raw nuts are valued for their nutritional profile in health-conscious cooking.