1/2 c. soy sauce
4 tbsp. dark sesame oil (don't use light)
2 tbsp. Dijon mustard
2 tbsp. sugar
4 tsp. minced garlic (2 cloves)
2 tsp. grated lemon zest
1 tsp. dried red pepper flakes, optional

Mix all together. This is enough for about 5 pounds meat.