Cook the pasta

• Bring a large pot of salted water to a boil.
• Cook the pasta until al dente, then reserve a little cooking water and drain.

Toast the walnuts

• Toast the chopped walnuts in a dry pan over medium heat until fragrant and lightly golden.
• Set a few aside for serving.

Brown the butter

• Add the butter to the pan and melt over medium heat.
• Swirl until it foams and turns golden brown with a nutty aroma.

Combine and serve

• Add the drained pasta to the brown butter and walnuts and toss, loosening with a splash of pasta water.
• Stir in the grated parmesan and season with black pepper.
• Serve topped with the reserved walnuts.