Cabbage Roll Casserole

2 lbs ground beef, browned
1 C onion, chopped
29 oz can tomato sauce
1 head cabbage, chopped
1 C instant rice (I added a little more because I love rice)
1 tsp salt
14 oz can beef broth

Combine all ingredients, except broth in an ungreased, deep 9 x 13-inch baking pan. Drizzle with broth; cover with aluminum foil. Bake at 350 degrees for one hour; uncover and stir. Cover again and bake 30 additional minutes, or until rice is cooked and casserole is heated through. Makes 10 to 12 servings.