Combine bread crumbs, spaghetti sauce mix and 3/4 c. tomato sauce; add eggs, beef and seasoned slat. Stir with fork and shape into oval. Place in shallow baking dish and brush with remaining tomato sauce. Bake at 350° for about 1 hour. Allow to cool for 10 min.; cut into 1/2" slices. Spread cut sides of bread with butter. Arrange pickles on bottom slice of bread; place meat loaf slices over pickles. Cover with top slice of bread and cut loaf into 8 servings.