Tentsuyu
Tentsuyu is Japanese tempura dip. The recipe for tentsuyu depends on the seasons and on the ingredients for which tentsuyu is being prepared. A general, all-purpose, tentsuyu might consist of three parts dashi, one part mirin, and one part soy sauce. For ingredients with strong odors or flavors, however, sake and sugar might be used instead of mirin, or more or less shōyu might be used.
Source: Wikipedia