Subway Sweet Onion Teriyaki Sauce

1/2 cup Corn Syrup
1 tbsp. Sweet Onion, minced
1 tbsp. Red Wine Vinegar
2 tsp. White Vinegar
1 tsp. Balsamic Vinegar
1 tsp. Brown Sugar
1 tsp. Powdered Milk
1/4 tsp. Lemon Juice
1/8 tsp. Poppy Seeds
1/8 tsp. Salt
1/8 (or less) tsp. Black Pepper
1/8 tsp. Garlic Powder

Whisk all of the ingredients in a microwave-safe bowl.
Place in microwave for about 1-3 minutes, or until heated through.
Allow to cool.