Jim
I really had not put much thought in using something like this to cook with. Sounds like something we guys that camp off the grid should look into...
I imagine you will be tracking the right sun angle for maximum heat. Probably be cooking with thermo-gun meter handy haha... I would think you would have too much heat....
I got an old SAT DISH here I line the inside with foil and it works great melting snow on my side walk haha...
Seems like you could make a pretty solar stove good rather easy...
I know all of us carry a small magnifying glass to be able to start a fire when we need one. Got a compass with a mirror lid just for doing that haha...
Roy Ken