Yuzu

This fruit looks somewhat like a small grapefruit with an uneven skin, and can be either yellow or green depending on the degree of ripeness. The yuzu's flavour is tart and fragrant, closely resembling that of the grapefruit, with overtones of mandarin orange. Yuzu, which are very aromatic, closely resemble sudachi (Citrus sudachi, a Japanese citrus from Tokushima Prefecture, a yuzu–mandarin orange cross) in many regards, though unlike the sudachi, yuzu eventually ripen to an orange color and there are subtle differences between the flavors of the fruit. Most commonly used to season or make ponzu sauce, or combined with honey to make a syrup for tea. Be sure to add this to your next salad dressing for an exciting citrus punch!