2/3 cup Mirin, (Japanese sweet rice wine)
1 cup Soy sauce
4 1/2 tsp Rice vinegar
1 tsp Sesame oil
1/3 cup White sugar
7 cloves Garlic, minced
1 tbsp Fresh ginger, minced
1 dash Red pepper flakes
Black pepper, to taste
Bring mirin to a boil in a saucepan over high heat. Reduce heat to medium-low, and simmer for 10 minutes. Pour in soy sauce, rice vinegar, sesame oil, and sugar. Season with garlic, ginger, pepper flakes, and black pepper; simmer an additional 5 minutes. Store in a tightly sealed container in the refrigerator.