Cold Soba Noodles with Dipping Sauce

Where the sesame sauce in the recipe makes for a rich, hearty dish, this one is elegant and light. In Japan—where it gets plenty hot in the summer—cold soba noodles, served with a dipping sauce, are a common snack or light meal. Soba are brown noodles, made from wheat and buckwheat, and the sauce is based on dashi, the omnipresent Japanese stock. (You can also serve somen, thin wheat noodles, cold; cook them for a little less time, but also until tend