A kumquat is a very small, sour citrus fruit. Kumquats look like tiny oranges — and you eat them whole, skin and all.
Kumquats are often used to make jam or cooked with sugar to counter their acidic flavor. If you're a fan of sour candy, you might love the taste of a fresh kumquat, and the sensation of biting through its sweet rind to a sour burst of juice at the center. Kumquats originated in China, and their name comes from the Cantonese kamkwat, from kam, "golden," and kwat, "orange."