But if you want to turn your cold 'za back to its warm glory because you're nicer and have a better taste, you might not have many choices.
When you microwave it, the top gets wet. The oven takes a long time to heat up, and I've found that this can dry out the slice.
Then, put your slice in a hot pan. Be careful not to crowd or stack them, because that will make them mushy.
„Let the bottom cook for about 30 seconds to a minute"—then add a few splashes of water to the side of the pan, making sure they don't touch the slice.
After that, cover it and let it steam for "maybe three or four minutes... until the top's nice and gooey."
Staub, a company that makes cookware, and Chris Ancona, who used to be the head pizzaiolo at Roberta's,
both suggest this method. Today even tried a few different ways to warm cold pizza and this one worked the best.