Subway Style Sweet Onion Sauce

Try my recipe to authentic Subway style Onion Sauce

Ingredients

1 Cup of Water
1 Cup Onion Juice
1 TSP Nigella Seeds or Kalounji
1 TSP Ginger Powder
1 TSP Salt
1/3 Cup Sugar
1 TBSP (15 ML) white vinegar
3 TSP Corn Starch