I am cooking challrnged. I'm good at popping pizzas in to the oven and heating them up. Except for one time. I had a nice pizza with everything on it and put in the oven as usual. I took it out and TRIED to slice it. How come this pizza is so tough? Then I looked. I had cooked it while it was sill sitting on the cardboard! It was also pretty doughy. Now I MAKE SURE that I had RENOVED the cardboard first!