Sesame and Soy Dressing for Cold Noodles 冷やし中華だれ

This simple dressing from NHK's cooking site is a version that we use in our house for cold noodles, either somen or soba.

150 ml soy sauce
90 ml rice wine vinegar
5 Tablespoons sugar
1 Tablespoon sesame oil

Mix the soy sauce, vinegar and sugar in a bowl until the sugar dissolves. Add the sesame oil. Will keep for about a week in the fridge.