Kombu dashi is made by soaking kombu (a style of edible dried kelp) in drinking water. It's a mild taste with delicate hints of umami, but that’s it. Even several Japanese people living in Japan think it’s an excessive amount of of a hassle to get genuine shabu-shabu at home. https://archer67w01.activosblog.com/32989694/rumored-buzz-on-shabu