One 3 x 6 inch piece of konbu
8 cups of water
2 handfuls of katsuo-bushi
Rinse the konbu. Combine it with water in a saucepan. Bring water to a simmer. Turn off stove. Steep for 10 minutes.
Remove the pan from heat. Add the katsuo-bushi. Cover and let steep for 7 minutes.
Strain the dashi through cheesecloth.