04Meanwhile, cook 12 oz. bucatini or spaghetti in a large pot of boiling salted water, stirring occasionally, until very al dente, about 2 minutes less than package directions. Drain, reserving ½ cup pasta cooking liquid.
05Pluck out and discard basil sprigs. Stir reserved pasta cooking liquid into sauce and bring to a boil. Add pasta and cook, tossing vigorously, until pasta is al dente and sauce thickens and coats pasta, about 2 minutes. Remove from heat and add ¼ cup finely grated Parmesan or Pecorino and 2 Tbsp. unsalted butter, cut into pieces; toss until combined and cheese is melted.
06Divide pasta among shallow bowls; top with more cheese.