I want to make the world’s longest griddle so we can cook a dozen Jiffy Pops at the same time, as a race. Criteria: cheap, safe, single-use.

The heat source could be BBQ charcoal, but maybe simpler/faster to start & stop would be a dozen cans of Sterno canned heat.

The JiffyPop aluminum pan sometimes melts over open flames, so instead of a wire mesh I’m thinking a metal griddle would be best. But a proper cast iron griddle would be too expensive. A long sheet of aluminum siding would probably melt through. How about a long section of galvanized steel ductwork, the type used in home heating? Would exposing that to direct flame be a problem? Any other suggestions?

Note the food itself won’t touch the griddle; I’m not frying eggs. I just need a flat surface that will take the heat for an hour, ideally something I can buy cheaply off the shelf.

Thanks!