Chicken Tacos

Combine the following ingredients in order and bring to a boil:

3 Tbsp. Butter
1 small Onion or 1 Tbsp. Onion Flakes
1 Tsp. Mustard
1 C. Ketchup
1/2-1 C. Water
2 Tbs. Vinegar
1 Tbs. Worceshire Sauce
2 C. Brown Sugar
4 Shredded Chicken Breasts

* Serve in tortillas and top with your favorite taco toppings.