The glories of summer produce are starting to show up, including the long-awaited return of tomatoes! I usually only buy small cherry tomatoes the rest of the year, so my excitement knows no bounds when big beefsteaks, colorful heirloom tomatoes, and dry-fleshed canning tomatoes appear. Here are five things you might not know about this fruit that’s used as a vegetable. Green tomatoes aren’t a type of tomato (with the exception of the Green Zebra, an unusual cultivar).