Stir fry vege (brown) sauce

ingredients

½ cup low-sodium soy sauce
½ cup low-sodium vegetable stock, or water
1 teaspoon sesame oil
½ Tablespoon rice vinegar
2 cloves garlic, minced
1 – 2 teaspoon grated ginger
1 Tablespoon sugar or honey*, up to 2 tablespoons for a more sweet than sour sauce
1 Tablespoon cornstarch
Pinch red pepper flakes, optional