Tomatillos

Noun
1. Mexican annual naturalized in eastern North America having yellow to purple edible fruit resembling small tomatoes
(synonym) miltomate, purple ground cherry, jamberry, Physalis philadelphica
(hypernym) ground cherry, husk tomato
2. annual of Mexico and southern United States having edible purplish viscid fruit resembling small tomatoes
(synonym) jamberry, Mexican husk tomato, Physalis ixocarpa
(hypernym) ground cherry, husk tomato
(part-meronym) husk tomato, Mexican husk tomato
3. small edible yellow to purple tomato-like fruit enclosed in a bladderlike husk
(synonym) husk tomato, Mexican husk tomato
(hypernym) solanaceous vegetable
(part-holonym) jamberry, Mexican husk tomato, Physalis ixocarpa

Small, green, firm, tomatoes. They are covered with a paper like husk that's removed before cooking. Their acid flavor add a great flavor for sauces.