Tentsuyu (てんつゆ/天汁) is Japanese tempura dipping sauce.

The recipe for tentsuyu depends on the seasons and on the ingredients for which tentsuyu is being prepared. A general, all-purpose, tentsuyu might consists of three parts dashi, one part mirin, and one part shoyu (Japanese soy sauce). For ingredients with strong odors or flavors, however, sake and sugar might be used instead of mirin, or more or less shoyu might be used.

Similar ingredients make up the simmering sauce for donburi and the broth for dishes like agedashi tofu (deep-fried tofu in broth) and soba (buckwheat noodles).

Tentsuyu in concentrated form is commonly sold in a small bottles in supermarkets and grocery stores throughout Japan—and also in Asian grocery stores in the US.

When used for tempura, tentsuyu is commonly served with grated daikon white radish.

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