I used to make this in my college days for cook-outs and bar-b-ques (bikers love their cook-outs). I would bring my Hibachi and grill up some bar-b-que chicken on one half and keep the beans warm on the other side. I would also bring my sour cream potato salad (recipe in my collection) in a bowl set in ice. Needless to say I'd spend the time cooking all the chicken and never had any left overs - of anything.
Cook bacon till crisp; drain, reserving drippings. Crumble bacon. Cook onion in drippings till tender.
In a 1 1/2 quart casserole add cans of pork and beans. Dump brown sugar, Worcestershire sauce and mustard on the top in a pile. Pour the hot onions with drippings into the middle of this pile (melts the brown sugar a little), add bacon, mix well. Bake, uncovered at 325 for 1 1/2 to 1 3/4 hours.