With its sweet skin and tart pulp, kumquats taste like an inside-out orange. The small ovular fruit can be eaten whole to savor the contrast in flavor — or, if bitter isn't your thing, just eat the fiber-rich peel for a straight burst of sweetness. This exotic fruit also provides a blast of vitamin C, an antioxidant that helps to prevent arthritis, cataracts, and macular degeneration, while promoting radiant, glowing skin and healthy, strong hair. Pop it in your bag for a perfect on-the-go snack; or slice into rounds and toss in a salad for a little zest. You can even add these under-the-radar gems to your favorite smoothie recipe for a bright shot of citrus flavor — yum!