A tomatillo is a small, round fruit that is often green or yellow and is encased in a papery husk. It belongs to the nightshade family, which also includes tomatoes and potatoes. Tomatillos are commonly used in Mexican cuisine, particularly in salsas and sauces, due to their tangy flavor. These fruits are rich in vitamins C and K, as well as antioxidants. Tomatillos can be eaten raw or cooked, and they are typically harvested when they are firm and the husk has turned brown. They are a key ingredient in dishes like green salsa and enchiladas.