I personally would never cook anything in the dishwasher, wrapped or not. You have no control over the heat, can't see what is going on in there, and there has bound to be traces of chemicals floating around in there. Not to mention it is kind of disrespectful to the food. I would also be wary of cooking things on the BBQ wrapped in foil, especially when using something acidic, like lemon. The aluminium reacts with the acid and breaks down, creating a nasty aluminum residue in your food. Take a lemon, cut it in half, wrap in foil, wait a few hours and see what it looks like. Bob Blummer ugh.