The essence of Japanese soup, dashi is a flavorful broth made from simmering kombu (kelp, a kind of seaweed) in water. Wipe it with a damp cloth before using, and cut into strips with kitchen shears to extract maximum flavor. Shiso is a member of the mint family. Look for both kombu and shiso at Asian specialty markets. If you can't find shiso, use spinach.
Cooking Light JANUARY 2008
To prepare dashi, combine 8 2/3 cups water and kombu in a saucepan; bring to a boil. Partially cover, reduce heat, and simmer until reduced to about 4 cups (about 1 hour). Strain dashi through a sieve over a bowl; discard the solids.
Place 1/4 cup dashi in a small bowl; stir in miso. Return dashi to pan; bring to a simmer. Add mushrooms, tofu, and ginger to pan. Simmer 10 minutes; discard ginger. Stir in green onions and shiso.
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