French-style Stuffed Beef Burger
Prep Time: 20 minutes Cooking Time: 2 hours Serving: 4 Ingredients: 1 pound ground beef (80% lean, 20% fat) 4 slices Swiss cheese 4 tablespoons Dijon mustard 4 hamburger buns 1 tablespoon olive oil Salt and pepper to taste For the Stuffing: 1/2 cup chopped …