Adjust oven rack to 6 inches from broiler
element and heat broiler. Heat 12-inch cast-
iron skillet over medium heat for 5 minutes.
Toss tomatoes with oil and 1 teaspoon salt. Add
tomatoes to skillet and cook, stirring
occasionally, until lightly charred and
blistered, about 10 minutes. Stir in garlic,
tomato paste and pepper flakes and cook until
fragrant, about 30 seconds. Off-heat, coarsely
mash tomatoes using potato masher.
Stir in pasta and water and bring to a boil
over medium-high heat. Reduce heat to a
vigorous simmer, cover and cook, stirring
often, until pasta is tender, about 15 to 18
minutes.
Stir in Parmesan and adjust sauce consistency
with extra-hot water, as needed. Stir in basil
and season with salt and pepper, to taste.
Sprinkle with mozzarella. Transfer skillet to
oven and broil until cheese is melted and a
spotty brown, about 5 minutes. Serve.
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