BBQ Sauce

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4 sticks (16 ounces) unsalted butter

1 yellow onion, diced 

1/4 cup chopped garlic

1/4 cup dark chili powder 

2 tablespoons smoked paprika 

1 tablespoon dry mustard 

1 tablespoon garlic powder 

1 tablespoon onion powder 

1 teaspoon cayenne 

3 cups brown sugar 

3 cups molasses 

3 quarts ketchup 

1 cup Dijon mustard 

1 cup Worcestershire sauce 

1 cup cider vinegar 

Kosher salt and fresh ground black pepper