In large bowl, break ground beef into small pieces. Sprinkle over bread crumbs, spaghetti sauce mix, most of the tomato sauce. Save a little to top the meatloaf. Mix together lightly and add eggs and salt. Mix until well blended. Press mixture into a loaf dish or bread baking pan and brush with remaining tomato sauce. Bake for 1 hour at 350.Pour off fat and cool. Refrigerate overnight. Slice into 1/4" or thicker portions for sandwiches. Garnish with lettuce, catsup or chili sauce. Excellent served with buttered pumpernickel or sour dough French bread.
Variations: Blend in very small cubes of cheddar or processed American cheese (about 1/4 cup) before baking, or add sliced cheese to the sandwich. Makes 8 to 12 sandwiches (big)
Source: Come Into the Kitchen