Step 1

Combine the water, soy sauce, brown sugar, mirin, sesame oil, garlic, and ginger in a saucepan.

Step 2

Bring to a low simmer, and cook for 5 minutes.

Step 3

Combine the water and corn starch and make a slurry.

Step 4

Drizzle into the simmering sauce and whisk until thickened.

Step 5

Stir in the green onions and sesame seeds while still hot.