For the Dashi: Wipe the konbu lightly with a dry cloth. Place in a large pot with 2 quarts cold water. Bring to boil over medium heat. Remove konbu. Return to a boil. Add the bonito flakes, and remove from heat. Let stand 2 to 3 minutes. Strain through cheesecloth to remove flakes. (Makes 2 quarts)
2
In a saucepan, heat dashi over low heat. Place miso in a fine strainer, and place in dashi. Using a whisk, gently pour miso through strainer. Cook till heated through.
3
Place tofu slices in soup, and cook until they rise to the top, about 1 minute. Add scallions to soup bowls, and ladle soup over. Serve immediately.
