The tomatillo is a plant of the nightshade family, related to the cape gooseberry, bearing small, spherical and green or green-purple fruit of the same name. Tomatillos originated in Mexico, and are a staple of that country's cuisine. Tomatillos are grown as annuals throughout the Western Hemisphere.The tomatillo fruit is surrounded by an inedible, paper-like husk formed from the calyx. As the fruit matures, it fills the husk and can split it open by harvest. The husk turns brown, and the fruit can be several colors when ripe, including yellow, red, green, or even purple. Tomatillos are the key ingredient in fresh and cooked Latin American green sauces. The freshness and greenness of the husk are quality criteria.
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