A cooking surface for use with cooking kettles, such as outdoor grills, is disclosed. The cooking surface is made from a single sheet of stainless steel of sufficient thickness to prevent warping under normal cooking temperatures. The cooking surface has a grill section with a plurality of parallel slots cut into the stainless steel to emulate a rack type cooking surface and a griddle section that is substantially solid. Two embodiments of the combination griddle and grill cooking surface are disclosed, one directed to a rectangular kettle and one directed to a circular kettle. An adaptable embodiment of the rectangular cooking surface having extendable slide bars to fit various size cooking kettles is also disclosed.