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1/2 cup extra-virgin olive oil, plus more for serving
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2 small shallots, thinly sliced (about 1/2 cup)
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3 tablespoons thinly sliced garlic (about 5 large garlic cloves)
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1 1/2 tablespoons chopped jarred Calabrian chiles
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1 teaspoon kosher salt, divided, plus more to taste
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1 pound fresh mustard greens, thick stems removed and leaves chopped, or 1 (16-ounce) package pre-chopped mustard greens, stems removed (about 16 packed cups)
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3/4 pound uncooked pappardelle or tagliatelle pasta
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1 (15.5-ounce) can cannellini beans, drained and rinsed
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2 ounces Parmigiano-Reggiano cheese, grated (about 1/2 cup), plus more for serving
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2 tablespoons fresh lemon juice