I tried this recepie for a carmelized plum upside down cake last Sunday and the recepie said to grill the cake. so, instead of reachong for a cake pan, I grab my trusty 3 generation old cast iron skillet. I used natural lump charcoal for some added flavor in the cake and baked it at about medium indirect heat for probably 45 min. Let me tell you, smoke flavor in a cake is fantastic! I'll dig up the recepie tomorrow and post it here. It was out of a weber cookbook. I woulda posted pix but the cake disappeared.