Always a problem, but the following works best for me: Put the pizza, slices or pie, UPSIDE DOWN in the oven (on a plate or tray, of course!). Put the oven on broil, and place the oven grate up pretty high, but not too close to the flame. When the bottom gets charcoaly (or more charcoaly) it's done -- it takes a little dexterity to get the red-hot plate or pan out and then flipped into a cool plate, but it's worth it. Sometimes I even put the flipped guy back in for 30 seconds just to ensure the cheese is thoroughly melted.
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