Found some people that have done this so going to give it a try...cut out the stem like a round bowl on the bottom...in that bwl put butter w/spices or bbq sauce or both...found two ways to cook it...(1) make a aluminum ring out of foil and place cabbage in that or (2) put in a baking pan with little water...put on grill away from heat and close cover...cook for 15 to 20 minutes or until tender...can do with green cabbage also