Citrus fruits are Mother Nature’s gift of vitamin C during the winter, just in time to chase away the sniffles. The bright colors of oranges, lemons, limes and grapefruit are a welcome relief to gray winter days; their juice is a refreshing treat; and they’re packed with ascorbic acid and antioxidants. Today, we take a look at some of their less familiar cousins also rich in vitamin C. Think kumquats, pummelos, and pomegranates — and we’re throwing in pineapples because we love them. Kumquats are about the size of a large grape. Unlike other citrus, the peel of the kumquat is sweet and edible, while the juicy flesh is tart. They add a nice snap of flavor in salads. They can be found at Middle Eastern markets fresh or pickled in heavy syrup.