While the pasta is cooking, melt the butter in a large pan over medium heat until it bubbles and foams (add the sage leaves if using) and remove from the heat.
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.
Cover with thin slices of fresh truffle using a truffle slicer and serve immediately.
Notes
Use your preference of salted or unsalted, or even truffle butter.
To make a Parmigiano crisp, simply grate some Parmigiano Reggiano DOP and sprinkle it into a nonstick pan to melt until crisp. Remove carefully, and allow to cool on a flat surface until set.
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