The BoomChef Mark I (details) is a solar grill intended to cook hotdogs at boomerang competitions. I distinguish it from the more common solar roaster oven design because I put as much solar energy as practical into heating up a grill surface. Hotdogs sizzle when you put them in. It captures direct solar energy through the top glass, and more reflected up from the bottom.
It's a black aluminum grill that fits inside a wooden frame, glass on the top & bottom and reflectors to bounce in extra sunlight. I lined the inside of the box with aluminum and weatherstripped the glass. It can reach 250F on a sunny day.