I've made a phase 2/3 South Beach version of this recipe using pinto beans and Splenda brown sugar, but nothing beats Mom's original recipe (which is below):
4 slices bacon (optional)
2 Tbsp bacon drippings
1 medium onion, chopped
1 Tbsp Worcestershire sauce
2 lbs. Campbell's Pork & Beans
2 Tbsp brown sugar
1 tsp prepared mustard (usually Gulden's Spicy Brown)
(if using bacon) Cook bacon until crisp; drain & crumble.
Cook onion in bacon drippings until tender.
Add all ingredients into an uncovered casserole dish and mix well.
Bake at 325 degrees for 1.5 to 1.75 hours.
*Mom used to never cook the onion or use bacon (only bacon drippings). She would throw all the ingredients together in the casserole, leaving the chopped onion raw. It still came out awesome.