Beefy Pasta Casserole

One of those great comfort foods just in time for the cold weather season! Totally delicious too!! 1-1/2 cups ziti pasta 1 pound lean ground beef 1 cup chopped onion 2 (15 oz) cans tomato sauce 1/2 teaspoon salt 1/2 teaspoon ground black pepper 1 tablespoon Italian...