Preheat oven to 450 degrees. Spread basil pesto on each of two pizza crusts.
Layer each crust with plum tomato; sprinkle with grated mozzarella cheese. (Or, layer with just cheese, using 3 ounces thinly sliced fresh mozzarella.) Season with coarse salt and ground pepper.
Transfer to a baking sheet; bake until cheese has melted and crust is golden brown, about 10 minutes. Slice, and serve immediately.
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