Physalis philadelphica, commonly known as the tomatillo, is a small, green fruit native to Mexico and Central America. It is encased in a papery husk and is a key ingredient in many traditional Mexican dishes, such as salsa verde. The fruit has a tart flavor and is often used in cooking when unripe. Tomatillos are part of the nightshade family, which also includes tomatoes and potatoes. They thrive in warm climates and require full sun for optimal growth. Rich in vitamins and antioxidants, tomatillos are not only flavorful but also nutritious, making them a popular choice in various cuisines.