Most of us don’t question canned pumpkin—it’s on the label, in the baking aisle, and the star of pumpkin pie. But here’s the catch: the purée inside likely isn’t from the round orange pumpkins you carve at Halloween. Not the Jack-o’-Lantern Kind Canned pumpkin comes from close relatives in the squash family. The FDA allows purée from varieties like Cucurbita...