Rinse the beans, soak in 6 cups of water overnight. Do not drain.
Simmer on low heat, covered, do not boil, until just tender, about 30 minutes.
Drain broth into a measuring cup, reserving the bean broth.
Cut the salt pork or bacon in half, chop one half, and separate the other half into strips.
Preheat your oven to 150° C (300° F), get out a 2 quart casserole.
In a mixing bowl, add the beans, chopped salt pork, 2 cups of the bean broth, onion, mustard, molasses, chili sauce, and vinegar. Mix together.
Pour mixture into the casserole and spread out evenly. Top with the salt pork slices.
Cover and bake for 2 hours. Uncover and continue baking for 30 minutes. If the beans look dry, and more bean broth or hot water.
Serve and enjoy.