Do you ever want to re-heat last night's pizza but hate the sogginess that comes from using the microwave? Well, somewhere or other I read about this method and it's the best way to do the job. Just put a little olive oil in a cast iron skillet, put the heat on low or medium-low, add pizza slices and a lid. The crust will crisp as the cheese gets soft and melty. It takes about 5 minutes or so.