In a large skillet, after cooking bacon, remove bacon and all but 2 tablespoons of the fat.
Add onions and cook for 4-5 minutes, or until softened.
Add in the beef, cook well over medium heat, breaking it down only to small grape sizes. Cook until well browned.
Stir in ketchup, tomato paste, Worchestershire, Dijon, beer, and beef broth.
Continue cooking until the sauce starts to evaporate and the mixture becomes "sloppy", versus "soupy" (about 5-6 minutes).
Add the chopped cheese curds and bacon one minute before serving.
Spoon the mixture over toasted brioche buns.