According to www.fruitsinfo.com The Yuzu is a hybrid of the mandarin and the papeda (a bitter primitive citrus). The aromatic Yuzu is considered to be the most important fruit in Asia.
The Yuzu is believed to contain many health benefits.
Lots of vitamin C
Great for your skin
Burns fat
Vitamin P for Blood flow
The Yuzu I tried that is pictured above was sour but not an unpleasant sour like a white grapefruit. More like an orange zest kind of sour. I thought the juice was good over fish.