but the telltale sign of traditionally-made ponzu is the taste of yuzu. Yuzu is an Asian fruit belonging to the citrus family, which looks like a smaller lemon with rough, bumpy skin. Its flavor ...

A full-size, ripe yuzu is comparable in size to a tangerine, but has a yellow peel. The citrus is a staple in Japanese cooking and a key ingredient in condiments like ponzu and yuzu kosho.