3 1/3 c. dashi or sardine stock
1/2 c. nameko or shiitake mushrooms, sliced
1/3 cake tofu
4 tbsp. red miso
4 stalks trefoil
ground sansho pepper
Soften the miso in a bowl with 2 tbsp tepid stock, whisk. Ladle the miso into the stock, simmering over medium heat. Add the solid ingredients. Do not boil. You can really use all sorts of ingredients instead of these, this is just a starter.
Source: Japanese Cooking, a Simple Art, by Shizuo Tsuji, p. 156-157