While the pasta is cooking, melt the butter in a large pan over medium heat until it bubbles and foams and remove from heat. Add the truffle sauce or zest along with the sage, if using.
When the pasta is al dente, drain using a pasta fork and transfer it directly into the melted butter.
Toss with the Parmigiano Reggiano, adding some pasta water if needed.
Transfer to serving plates and top with more cheese, if desired. Serve immediately.
Notes
Use truffle butter instead of plain butter, if desired.
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