"Recipe for stuffed peppers with sirloin steak, cremini mushrooms, onion, and provolone cheese, including red wine vinegar, Worcestershire sauce, Dijon mustard, pickled cherry peppers, and parsley. Use 4 medium halved peppers, 1 1/4 lb sirloin steak thinly sliced, 8 oz cremini mushrooms sliced, 1 medium onion sliced, 1 tbsp red wine vinegar, 1 tbsp Worcestershire sauce, 1 tsp Dijon mustard, 8 mild pickled cherry peppers sliced, 3 tbsp chopped parsley, 4 oz provolone cheese grated, and 4 tbsp olive oil divided. Season with kosher salt and pepper."