Wowsers.
I’ve seen plans for a solar cooker floating around the net somewhere. That’s on my to do list actually. Another way to heat food that doesn’t involve a fight with my A/C in the summer.
There is a you tube video that I saw from the extension center @ a Florida University. She used a styrofoam cooler - very easy and inexpensive, IIRC. I didn’t save the link though.