Tentsuyu

Tentsuyu is a traditional condiment, a dipping sauce made for tempura that consists of dashi stock, soy sauce, and mirin. The basic recipe for tentsuyu is the same as the one for mentsuyu (used for noodles), but the ratio of dashi to soy sauce to mirin is 4 :1 : 1 when making tentsuyu, while the one for mentsuyu is 5: 1 : 1.

Tempura is usually served with tentsuyu and grated daikon or ginger. In its concentrated form, this condiment is often sold in small bottles in most Japanese grocery stores.