In the same pan, lower the heat to medium and add the soy sauce, rice wine vinegar, brown sugar, minced garlic, ginger paste, cornstarch, and red pepper flakes. Stir to combine, then bring the sauce to a gentle boil. Let it simmer for 1–2 minutes, stirring frequently, until it thickens slightly.
⅓ cup Soy Sauce, 1 Tablespoon Rice Wine Vinegar, ⅛ cup Brown Sugar, 2 cloves Garlic, 1 teaspoon Ginger Paste, 1 teaspoon Corn Starch, ½ teaspoon Red Pepper Flakes