Combine beans, water, and onion in a large dutch oven.
Bring to a boil, cover, and remove from heat for 2 hours (or soak beans in cold water overnight) Return to heat, bring to a boil, and simmer slowly until beans are very tender, about 3 hours.
Coarsely mash beans with a potato masher, and add bacon drippings; mix well.
Continue cooking, stirring frequently, until beans are thickened and fat is absorbed.
Salt to taste.
Serves: 6-8 servings
6 hours 5 minutes: 5 mins prep time, 6 hours cook time