Wiktionary
slow oven
n. An oven that is heated to a comparatively cool temperature, typically not more than 150 degrees centigrade or 300 degrees Fahrenheit.
Usage examples of "slow oven".
His head, with deep recessions in the hairline now, seemed to have been baked in a slow oven.
His bandaged right leg felt tight and ached as though it were cooking in a slow oven, but the knee bent normally and pain didn't stab up the thigh muscles.
Most of the records were gone, probably stolen by kids who had made it this far in, though by the end of that summer the magical vinyl wheels would have been as warped as if they had spent two months in a slow oven.
It opened into a sort of vestibule that was about as warm as a slow oven.
Six hours in a slow oven, and that concoction would put Martha in her place.