Dashi is a clear Japanese broth. It is rich in savoury ‘umami’ flavours which comes from the liquid ingredients of sake (or mirin) and tamari. The solid ingredients can include kombu seaweed and dried shitake mushrooms for a vegetarian version (or bonito flakes for a non-vegetarian version). Other flavours you can add are sliced carrot, coins of ginger and spring onion. All of this combined with water becomes the broth.
When strained the broth is used as a base for miso soup, noodle soups and other vegetable dishes.