What is the best way to make a vegetarian dashi?

Making a vegetarian dashi is easy. All you need is a piece of kombu and some dried shiitake mushrooms. Simply soak the kombu and shiitake mushrooms in water for a few hours, and then gently simmer the mixture for about 20 minutes. The result is a flavorful and umami-rich dashi that is perfect for vegetarian and vegan ramen.