Ingredients

One 6-inch piece of kombu 

2 to 3 ounces bonito flakes 

Preparation

Wipe kombu lightly with a dry cloth. Place in a large pot with 2 quarts cold water. Bring to boil over medium heat. Remove kombu.

Return stock to a boil. Add bonito flakes, and remove from heat. Let stand 2 to 3 minutes. Strain through cheesecloth to remove flakes.