I got this recipe from an old, old cookbook. I added the slow cooker aspect.

One pound dried northern or navy beans. Soak in plenty of water for at least 12 hour (overnight).

Next day, drain and add to slow cooker. Add 1/2 cup dark molasses. Add about 1/4 to 1/3 lb of fat back that has been rinsed of its salt, and cut into 3/4 inch squares. Add 2-3 tbsp of dried mustard (colman’s is good). Add 2 tbsp of decent bourbon. Add 3tbsp of sugar.

Add enough water to just cover beans and stir.

Cook on low for 18 hours. Can be eaten after cooking for 8 hours, better longer.