Growing Milpero (tomatillos) [moved from Home Cooking board]
They're also known as tomate de milpa, miltomate, and tomate milpero. Tomate de milpa is the most common term I think, at least in Mexico. Tradewindsfruit has them under "Purple de Milpa Tomatillo." I don't think theirs are supposed to be especially purple, they normally turn at least partially purple when fully ripe, but I don't know.