"Simple and easy homemade teriyaki sauce. Never buy a bottle again! Keep careful watch over sauce when it's over heat. Increase or reduce the amount of garlic, onion, and ginger to your liking. While hot, pour immediately over chicken, veggies, stir fry, etc., or store in an airtight container in the refrigerator for a week."
Combine soy sauce, sugar, vinegar, water, garlic powder, onion powder, and ground ginger in a saucepan over medium heat. Add cornstarch and mix thoroughly. Cook until bubbles start to appear, about 3 minutes. Reduce heat to low. Simmer until thickened, 5 to 10 minutes, stirring frequently.