Walnuts are nutrient-rich tree nuts known for their distinctive ridged, brown shells and their rich, slightly bitter flavor. They have a crunchy texture that becomes tender when baked or processed, making them a versatile ingredient in both sweet and savory dishes worldwide. Widely used in salads, baked goods, and as toppings, walnuts add depth and a subtle nuttiness to culinary creations across various cultures. Historically, walnuts have been valued since ancient times, symbolizing wisdom and prosperity in many societies, and remain a staple in Mediterranean, Middle Eastern, and Western cuisines.