- Heat oven to 300 F.
- Cook bacon in a Dutch oven until almost crisp. Add onion and a generous helping of salt and pepper.
- When onion is cooked, add beans, molasses, ketchup, sugar, mustard, and five cups of water to the pot. Bring to a boil.
- Cover the pot and place in the oven. Bake until liquid is reduced by half, about 2 1/2 hours. Uncover and bake, stirring once, until cooking liquid is thickened, about 1 1/4 hours more. Stir in vinegar and serve.
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