1 1/3 pounds ground sirloin, 90 percent lean ground beef 1 slice white bread, spread with softened butter, then cut into small cubes 1/8 cup (a splash) milk 1 egg 2 teaspoons grill seasoning blend, or coarse salt and black pepper combined 1/2 teaspoon ground allspice 1 rounded tablespoon tomato paste 1 medium onion, finely chopped, reserve 1/4 amount 2 pounds small red potatoes 2 tablespoons butter 2 tablespoons sour cream 2 scallions, chopped, whites and greens 1/2 cup milk 3-Condiment Pan Gravy: 2 tablespoons butter 1/4 medium onion, finely chopped, reserved from meatloaf mixture 2 tablespoons (a handful) all-purpose flour 1 to 1 1/2 cups beef stock 1 tablespoon ketchup 1 rounded teaspoon spicy brown mustard 1 tablespoon steak sauce Serving Suggestions: Baby Carrots, recipe follows Dressed Tossed Salad