4 Italian or submarine rolls
3/4 lb. lean ground beef
3/4 lb. sweet Italian sausage, casings removed
Salt and freshly ground black pepper
1 1/3 cups Marinara Sauce
1 lb. fresh mozzarella, cut into 8 slices
1. Position an oven rack about 11" below the broiler, and preheat broiler. Slice rolls open lengthwise 3/4 of the way through, so that they open like a book. Arrange opened rolls side by side on a baking sheet. Set aside.
2. Sauté ground beef and sausage meat together in a large skillet over medium-high heat, breaking up meat with a wooden spoon as it cooks, until brown and cooked through, about 15 minutes. Drain off and discard any fat in the pan, then spoon about 1 cup of ground meat into each roll, and season to taste with salt and pepper. Spoon about 1/3 cup marinara sauce over meat in each roll and top each sandwich with 2 slices of mozzarella. Lightly season again with salt and pepper. Broil until cheese is golden, about 7 minutes.