In a small bowl, mix together mayonnaise, Dijon mustard, and minced garlic. Set aside.

Heat 1 tablespoon of oil on a Blackstone grill over medium heat. Add the sliced onion and green bell pepper, season with salt and pepper, and cook until they are soft and slightly caramelized, about 7-10 minutes. Push to a cooler side of the grill.

Add the remaining tablespoon of oil to the grill. Add the thinly sliced prime rib and cook for a few minutes just until heated through. Be careful not to overcook, as the meat is already cooked.

Place each roll on the grill to brown them for 1-2 minutes.  Remove from the grill and spread the mayonnaise and mustard mixture on top.

Divide the warm prime rib into 4 sections. Top each section with the cooked onions and bell peppers and a slice of the provolone cheese.  Let them heat for a few minutes to melt the cheese.

Then place each individual section on the browned rolls.  Serve warm and enjoy!