Stir the batter once, pour it into the skillet and drizzle the remaining 2 tablespoons of olive oil on top.
06Cook the pizza over moderately high heat until the bottom is golden and crisp and the top is almost set, 2 to 3 minutes.
07Burst any large air bubbles with the tip of a knife.
08Sprinkle the tomato, onion, Parmesan and pepper over the top, then place the skillet under the broiler and cook until the pizza is golden and crisp, 4 to 5 minutes.
09Slide the pizza onto a work surface, cut into wedges and serve hot.