2 lbs. medium sized macaroni shells
1 tsp. salt
1 pt. sour cream
16 oz. shredded Provolone cheese
2 lbs. lean ground beef
1 qt. marinara sauce
1/2 tsp. pepper
16 oz. shredded Mozzarella cheese

Cook shells according to package directions until firm (al dente). Rinse and drain. Brown ground beef in skillet. Add salt and pepper. Stir in marinara sauce. Simmer 20 minutes. Using a deep lasagna pan or a very large casserole dish, line the bottom with half of the cooked shells. Cover the shells with half the meat sauce. Spread 1/2 pint of sour cream lightly over the sauce. Sprinkle with half of both cheeses. Repeat for the second layer in the same order - shells, sauce, sour cream, and cheeses. Cover the pan and bake at 350 degrees for 40 minutes. Uncover and bake 20 minutes more. The casserole is ready to serve when top cheese is melted and lightly browned. Serves 8-10.