The Concord grape is a plump, purple enigma. On the one hand, this earthy grape from the American Northeast is an instantly recognizable fruit flavoring for candies, jams, and sodas. On the other hand, Concord grapes are so intensely grape-flavored that some people assume it can’t be real. It’s too musky and rich and deep. That’s because Concord grapes are “fox grapes,” whereas most table grapes and wine grapes are European vinifera cultivars.