Mythbusters, food special with AB
"Jamie and Adam team up with celebrity chef Alton Brown to find out if you can cook lasagna in a dishwasher or a meal under the hood of a car. Then Kari, Grant and Tory test tryptophan and what things really taste like chicken."
re: The Dairy Queen
I didn't see a dishwasher segment. Maybe they filmed one, but left it in their online 'behind the scenes' collection.
There was a book a couple of decades ago called 'manifold destiny' with recipes for cooking on a car's engine (the exhaust manifold is the hottest spot). Also AB tried it on a small scale in the California segment of Feasting on Asphalt.
On this show they used a large V8 boat of a car; added insulation, and made a test drive with lots of thermocouples to map out the temperatures. Even so they had trouble finding much empty space because modern cars have lots of emissions controls and accessories. AB packed the Thanksgiving style items in containers to fit the spots with the best temperatures. They only evaluated the finished meal in the last couple of minutes. I think the only 'flop' as the gravy, which made a better soup.