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1
Heat the oven to high broil and arrange a rack in the middle.
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2
Place bell peppers directly on the rack.
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3
(The extra distance between the peppers and the direct heat of the broiler will cause the peppers to roast a bit before the skins blister.)
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4
Turn peppers so that the skins blacken and blister on all sides.
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5
Remove peppers from the oven and place in a heatproof bowl, cover tightly with plastic wrap, and let sit for about 30 minutes.
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6
Place pancetta pieces and rosemary sprigs in a medium frying pan over medium heat.
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7
Cook, stirring occasionally, until pancetta is slightly rendered and just browning around the edges.
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8
Remove to a plate lined with paper towels to drain.
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9
Return the pan (with drippings) to the heat and add onion.
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10
Stir once and then leave to caramelize.
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11
Stir a few more times so it doesnt stick to the pan.
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12
It is finished once it is golden brown and softened, about 10 minutes.
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13
Heat the oven to 400 degrees F and arrange a rack in the middle.
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14
When peppers are cool enough to handle, remove their skins and slice them open.
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15
Remove seeds and membranes and discard.
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16
Slice peppers into 1/4-inch-thick strips.
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17
Combine peppers with caramelized onion, season with salt and freshly ground pepper, and set aside.
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18
Roll out pizza dough to a 14-by-10-inch rectangle and transfer to a baking sheet.
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19
Brush dough with olive oil and sprinkle with kosher salt.
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20
Distribute 1/2 of the cheese over the dough.
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21
Spread the pepper-and-onion mixture over the pizza and top with pancetta pieces.
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22
Sprinkle with remaining cheese.
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23
Bake until the underside of the crust is golden brown, about 40 to 50 minutes.