dashi soy sauce is a soy sauce made with dashi, which is a basic stock used in Japanese cooking. dashi is generally made with kombu (dried kombu seaweed) and bonito (dried fish). dashi soy sauce has a savoury, umami flavour, thanks to the presence of dashi in its composition. It can be used in the same way as traditional soy sauce, to add flavour to noodle, vegetable and meat dishes, and to marinate food before cooking. It can also be used to season sauces, dressings and marinades.