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.
recipepes.comteriyaki sauce and marinade, Sauces recipePT15MPT1H5455 calories