1. Heat oven to 300 degrees. Cook diced pork in a Dutch oven over medium heat until fat begins to render, about five minutes. Add onion and cook, stirring, until pork begins to brown and onions begin to soften, about five minutes.
2. Rinse and pick over beans, checking for debris. Add beans and water to pot. Bring to a boil.
3. Stir in molasses, mustard, 1 1/2 teaspoon salt and 1/2 teaspoon pepper. Simmer 10 minutes. Cover and place in oven four hours or until beans are tender.
4. Uncover pot and stir. If mixture is very thick, add a little water. Cook uncovered for one hour or until mixture is no longer soupy. Taste and add molasses, mustard, salt and pepper if necessary.
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