Walnuts are the wrinkled seeds of the Juglans regia tree, harvested in autumn when their green husks crack open to reveal hard-shelled nuts. Once gathered, they’re sun-dried or mechanically cured to preserve their delicate oils. Inside lies a buttery, brain-shaped kernel rich in omega-3s and a mildly bitter, earthy-sweet taste. Also known as English walnut or Persian walnut. Commonly used in baking, salads, trail mixes, and nut butters, walnuts add crunch and depth to both sweet and savory dishes.