if i could build a custom cooker it would be one based on a carbon coil incandescent lamp... i have one to warm me up and it works great and i often think about rigging it up so it switches on while horizontal over top of my steak on a grill with an aluminium tray under it in actual fact, i totally could rig it this way, just need some bricks or something, even have the aluminium tray, only tricky part is how to make the safety switch on my carbon lamp stay on... at 900W it would totally cook a perfect steak in like 15 minutes, 7 min each side