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1
*30 minutes to 1 hour before you plan to bake your pizzas, place oven rack on the lowest level and arrange a stone or tiles on top; heat oven to maximum temperature500.
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2
The Pizza: add vinegar to a small saucepan; bring to a simmer over medium-low heat.
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3
Cook, swirling the pan occasionally, until the syrup is reduced and thickened and resembles honey, about 10 minutes; let cool (the syrup can be made ahead to this point).
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4
If it becomes too firm as it cools, simply reheat it with a few drops of water, or microwave it for 10 seconds.
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5
In a small skillet, heat the butter over medium heat; add the pear slices and cook until tender, about 5 minutes.
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6
Place 1 ball of dough on a floured surface; press out dough, lifting it and turning it over several times, until it reaches a 12-inch circle; do not knead dough or handle more than is necessary; if dough seems too sticky, dust it lightly with flour.
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7
Dust a pizza peel; carefully transfer the circle of dough to the peel, reshaping as needed.
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8
Shake the peel once or twice to make sure the dough does not stick; if it does, lift the dough and sprinkle the peel with more flour.
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9
Arrange half the pears on the shaped dough; scatter half the cheese on top; drizzle with half the vinegar syrup.
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10
Slide pizza onto prepared baking stone (in oven); after the pizza is on the stone, do not attempt to move it until it firms up in 2-3 minutes.
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11
Bake for 6-7 minutes, or until the crust is browned; remove pizza from the oven and arrange the prosciutto slices on top; cut into wedges and serve immediately.
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12
Make a second pizza with the remaining ingredients.
