Walnuts are nutrient-rich tree nuts known for their distinctive irregular shape and rough, grooved shell. They have a mild, slightly bitter flavor with a buttery texture that becomes crisp when toasted. Widely used around the world, walnuts are enjoyed in baked goods like cakes and bread, added to salads and porridges, or incorporated into savory dishes such as stuffings and pestos. Historically, walnuts have been prized since ancient times, symbolizing wisdom in several cultures and serving as a staple ingredient in Mediterranean, Middle Eastern, and European cuisines.