Wash and place in cooker with water to cover. Cover and cook at 15 pounds pressure for 20 minutes. Release steam very slowly, take cover off and remove beans from cooker. Place slices of bacon or salt pork in bottom of cooker and brown. Season beans. Add about a heaping tablespoon of sugar to fat, and stir until brown. Pour beans over fat and sugar. Stir sugar and fat through them. Place cover on cooker and cook for 20 minutes at 15 pounds pressure. Molasses or catsup may be added to beans if desired.