Mashed Potato Soup With Wasabi And Chives

Ingredients

• 1 large baking potato, such as idaho or russet
• 12 tablespoon unsalted butter
• 3/4 cup half-and-half
• 4 cup dashi
• 2 tablespoon sake
• 3 tablespoon light-colored soy sauce
• salt
• 1 ounce caviar, optional
• freshly grated wasabi and finely sliced chives, preferable baby chives for garnish
• 1 piece of dashi kombu, 4 x 6 inches
• 4 cup filtered spring water
• 1/2 cup loosely packed bonito flakes