Sushi Rice Risotto

Name: Sushi Rice Risotto
Ingredients: 1 1/2 cups cooked short-grain white rice; 2 1/2 tablespoons sushi vinegar, recipe follows; 3 cups Dashi, recipe follows; 1 teaspoon light-colored soy sauce; 2 eggs, beaten; 2 teaspoons grated fresh wasabi (* Chef's Note); 1 tablespoon shredded nori (kizami nori); 3 or 4 sprigs mitsuba leaves, minced, or chopped scallions or chives, for garnish; 1/2 cup sake-mash vinegar (akazu), or regular white wine vinegar; 1/2 cup rice vinegar; 1/2 cup sugar; 1/4 cup salt; 1 piece dashi kombu, 4 by 6-inches; 4 cups filtered spring water; 1/2 cup loosely packed bonito flakes