I just came across this great accessory for your 22.5″ (57cm) grill. Thanks to the dutch language blog Rookgordijn (Smoke Curtain) for pointing this one out. Its an interchangeable 4 section cast iron cooking grate. The four sections can be used with a variety of different cooking surfaces like a cast-iron grate, grill-stone, griddle and even a chicken stand. It is a very interesting product. I would be asking for one for my upcoming birthday but unfortunately it is only available in the 22.5″ format. All my grills are 18″. Oh well, maybe I can ask for a bigger grill instead! Click on the photo to go to the German manufacturers website.