Jon has been building and experimenting with Solar Ovens recently, which will hopefully culminate into a Solar Oven workshop with the next month while the sun is still high enough to use it effectively in NEMO.
He’s got one working made from a cardboard box, foil, wheat paste (a glue made from boiling wheat), a block of wood, and a plastic produce bag from the grocery store. It gets pretty scorching in there. It’s hit at least 250.
He designed it off of this one, and will be making a few other models too.