Drain the beans, reserving the liquid. Cook the bacon in a pan, and drain off any excess fat.

In a saucepan combine the syrup, salt, pepper, mustard powder, ketchup, Worcestershire, and honey. Bring to a boil over medium-high heat, stirring occasionally.

Place beans, onions, and bacon in a crockpot and pour sauce over top. Add the reserved bean liquid if needed to cover beans completely.

Cook on high in the crockpot for 12 hours.