Brown beef until cooked through.

Remove beef from pan, leaving the grease in the pan.

Add butter, diced onion and green bell pepper. Let cook 1-2 minutes then stir, let cook 1-2 minutes again then stir.

Add beef back to pan.

In small cup mix beef broth ans cornstarch.

Add beef broth mixture, ketchup, worcestershire sauce and salt and pepper to the pan.

Cook until the mixture is only slightly liquidy. (3-5 minutes)

Turn off heat and stir in provolone cheese. Serve on your choice of bread/rolls.