Place metal rack or trivet in bottom of slow-cooking pot. Sprinkle pork roast with salt and pepper; put on trivet in pot. Pour hot water around pork roast. Cover and cook on low for 8 to 10 hours or until done. Remove meat from pot. Place on broiler pan or oven proof platter. Combine molasses, mustard, vinegar, marmalade, and ginger. Brush over cooked pork. Brown in 400 F oven for 30 minutes, brushing several times with sauce.