This sauce is excellent for soba noodles, and fried Sushi rolls such as Spider Rolls, Fried Oyster Roll, Calamari Roll, and Shrimp Tempura Roll. Dashi is a soup and cooking stock considered fundamental to Japanese cooking. Dashi forms the base for Miso Soup, clear broth soups, Japanese noodle broths, and many Japanese simmering liquids. Most people use granulated or liquid instant substitutes found in Asian Markets. Shoyu is the foundation of Japanese cuisine, it is the essential ingredient. Shoyu is the most important condiment used to flavor food and also used to cook with. Shoyu can be found in most grocery stores (Asian food section) or in health stores. Shoyu can be stored at room temperature for up to one year.