"This spaghetti is a delicious weeknight meal!..."
INGREDIENTS
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2 tablespoons extra-virgin olive oil (plus more to finish)
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4 ounces pancetta (diced)
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2 cloves garlic (sliced)
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chili flakes (to taste)
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1 bunch collard greens (ribs removed, thinly sliced)
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1 pound spaghetti
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1/4 cup pecorino romano cheese (freshly grated)
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kosher salt and freshly ground black pepper (to taste)