Walnut
The walnut is a type of tree nut that has a hard, tough shell. The inner meat looks sort of like a tiny brain and has a rich, sweet taste. The walnut is the most widely-consumed nut in the world and has been enjoyed for well over 8,000 years. The majority of commercial walnuts come from California and China. English walnuts and black walnuts are the two most common varieties. They're eaten as-is after shelling or incorporated into delicious foods like bread, cakes, and even sauces for savory dishes.