The stainless steel lid helps to trap heat and moisture inside the casserole, ensuring that the food cooks evenly and retains its flavors and nutrients. A triple-ply stainless steel casserole with a stainless steel lid is a versatile and durable cookware option. It provides efficient heat distribution, is resistant to corrosion, and can be used for various cooking techniques such as braising, simmering, and slow cooking.