In a cast iron skillet, brown the meat over medium heat. As the meat begins to brown stir in the onions and continue cooking until meat is done and onions are tender, stirring occasionally. Drain any excess grease, if needed.

Stir in the brown sugar, Rotel, BBQ sauce and mustard. Simmer for about 5 – 10 minutes or until warmed through.

Spoon the mixture on top of the rolls and top with cheese. Serve warm.