BBQ Sauce

I made this today and it was yummy!

2 C. Ketchup
1/2 C. Vinegar
1 & 1/2 C. Brown Sugar (you can use less, but we like it a little sweet)
1/4 C. Spicy Mustard (regular is ok)
3 Tbsp Onion Powder
1 Tbsp Garlic Powder
2 Tbsp Butter
1/4 C. Worcestershire Sauce
1/2 tsp Salt
1/2 tsp Tabasco Sauce (if you don't like it spicy, omit this)
1/8 tsp Liquid Smoke (optional)