Step 1Wash the beans. Soak them overnight in water to cover generously.
Step 2The next day, drain the beans and place in a large saucepan with fresh water. Bring to a boil and cook until the skins wrinkle, about 1 hour.
Step 3Heat the oven to 325 degrees.
Step 4Drain the beans, reserving the cooking liquid. Place half the beans in a bean pot, top them with a layer of half the salt pork, then add the remaining beans, followed by the salt pork as the top layer.
Step 5Combine the sugar, mustard, paprika and salt to taste in a bowl. Add the chili sauce, tomato and 1/2 cup of the cooking liquid. Pour over the beans. Place the onion on top.
Step 6Cover the beans and bake them for 2 hours. Check the liquid occasionally. If the beans become too dry, add a little more of the cooking liquid. After 2 hours, increase the heat to 350 degrees and bake until the beans are tender and most of the liquid has been absorbed, 2 hours. If the beans are too wet, bake them an additional 30 minutes.