What Causes a Pan to Warp—and How Do I Fix It?

This method works best for cooking products that aren’t yet severely warped.

Use a Wood Block
For heavily warped cookware, try the wood block method. Follow the same steps as the towel and hammer method above (heat, place on a flat surface with a towel as a buffer), but place a wooden block on the metal and hammer that. You can hammer a little harder, and the wood will help distribute the blows to the metal.