North Carolina Barbecue Sandwich Sauce - cooking recipe

Ingredients

1/4 cup unsalted butter
6 tablespoons minced onions
1 1/3 cups cider vinegar
1 1/3 cups ketchup
1 cup packed brown sugar
1 teaspoon Worcestershire sauce
1/4 teaspoon cayenne pepper

Preparation

Melt the butter in a large, heavy saucepan over medium high heat.
Add the onion and saute 3 minutes.
Add the remaining ingredients and bring to a boil, stirring frequently.
Reduce heat and simmer, reducing saucec to 2& 2/3 cups.
Season with salt and pepper.
Serve with sliced or chopped pork roast or roast beef.