Ingredients

• 1/4c saké
• 1/4c soy sauce
• 1/2c mirin
• 2"x2" piece of kombu
• 1/2 - 1 cup katsuobonito

Instructions

1. Bring the sake to boil in a medium pot. Let the alcohol evaporate for a few seconds
2. Add soy sauce, mirin, kombu, and katsubonito
3. Bring to a boil and simmer on low for 5 minutes
4. Remove from heat, strain, and let cool