While pasta is cooking, toast black peppercorns in butter in a separate pan.
Grate Pecorino Romano and Parmigiano Reggiano cheese and add to blender.
Once pasta is cooked, reserve some pasta cooking water and drain the rest.
Add pasta to the pan with the toasted peppercorns and butter and toss.
While blender is running, slowly stream in pasta cooking water until a thick sauce forms.
Add the cheese sauce to the pasta and toss until fully coated.
Serve with additional grated cheese and black pepper on top.
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