Prepare ground beef in a pan over med heat
Strain cooked ground beef from pan allowing oil and drippings to remain
Add 2 tbsp of butter and combine over medium heat until creamy
Add 1 diced onion, 1 diced green pepper, diced mushrooms, and mix
Allow the vegetables to simmer for 2 min (only stir once after 1 min)
Return ground beef to pan mix and simmer for 3-5 min
To create your sauce in a large mixing cup or bowl combine 1 cup beef broth, 2 tbsp ketchup, 1 tbsp corn starch, 1/2 tsp black pepper, 1/2 tsp kosher salt, and 1 tbsp Worcestershire sauce. Mix well
Pour sauce onto simmering meat and stir until oils and sauce blend
Simmer on med-high until 75% of the liquid is gone
Once there is a minimal amount of liquid reduce heat to med-low
Evenly layer on 6-8 oz. of provolone cheese (sliced or shredded)
Stir in cheese until melted
Serve on toasted brioche buns