Anastasia’s Best-Ever Baked Beans

pork and beans (15 ounce cans – VanCamps’s Pork and Beans or similar)

medium or 1 large onion, chopped (yellow or sweet onion, not vidalia) 

to 2 tablespoons butter (for sauteing onions)

ketchup

molasses

yellow mustard

to 1/2 cup brown sugar (use less for less sweetness)

 to 8 slices uncooked bacon, each cut in half or thirds