Miso Glazed Black Cod in Kyoto Red Miso Crab Broth

Name: Miso Glazed Black Cod in Kyoto Red Miso Crab Broth
Ingredients: 1/3 cup sake; 1/3 mirin rice wine vinegar; 3 tablespoons brown sugar; 2 tablespoons soy sauce; 1/3 cup yellow miso; 4 (6-ounce) black cod fillets; 4 tablespoons red miso paste (recommended: Kyoto); 4 cups boiling water; 1 thumb-sized knob ginger, sliced; 2 garlic cloves, chopped; 1 teaspoon rice wine vinegar; 8 ounces lump crabmeat, picked over for cartilage and shell; 3 shiitake mushrooms, thinly sliced; 1 cup enoki mushrooms; 1 scallion, thinly sliced; Smelt egg, for garnish, optional