Wash and pick over beans and soak overnight. Drain.
Cook slowly in boiling water, salted, about 1-½ hours. Drain.
Lay half of pork and few slices of onion in bottom of roasterette and cover with half of the beans.
Put in rest of pork, onions, and beans. Add sugar, salt, mustard, and molasses. Cover with boiling water.
Cook on high heat until steaming commences, then on low for 5 hours or until beans are soft. Set cover ajar for last ½ hour to allow heavy browning.
