Step 1

Soak the beans in cold water overnight in a large container. Drain in a colander.

Step 2

Heat oven to 300 degrees. In a small saucepan, combine molasses, mustard, brown sugar, tomatoes, bay leaves, salt, pepper, and 5 cups water. Bring to a boil, and whisk until the sugar has dissolved. Stud the onion halves with the cloves, and place in the bottom of a terra-cotta bean pot or Dutch oven.

Step 3

Score the salt pork 1/4 inch deep 1 inch apart, and slice into two even pieces. Transfer to the bean pot. Add the soaked beans. Pour the molasses mixture over beans, stir, and cover. The liquid should cover the beans by 1/2 inch. Add more water if necessary.

Step 4

Transfer to oven to bake, without stirring, until the beans are tender and the liquid has thickened, about 6 hours. Check the beans every 45 minutes, adding more hot water if necessary to keep beans slightly soupy at all times. For the last 50 to 60 minutes of cooking, uncover beans, and, using tongs or a long fork, pull the pork to the surface. Remove from oven, and adjust the seasoning with salt and pepper, if necessary. Serve.