In a small bowl, whisk together the soy sauce, rice vinegar, sesame oil, grated ginger, minced garlic, and sweetener. Add optional red pepper flakes for heat to taste.
1/4 cup soy sauce, 2 tbsp rice vinegar, 1 tbsp sesame oil, 1 tsp fresh ginger, grated, 1 clove garlic , minced, 1 tsp maple syrup or agave, 1/2 tsp red pepper flakes