Boil the pasta

• Bring a large pot of salted water to a boil.
• Add the pasta and cook until al dente.

Warm the pesto

• Spoon the pesto into a bowl.
• Loosen it with a little of the hot pasta water.

Combine and serve

• Drain the pasta, keeping a little cooking water.
• Toss the pasta with the pesto until evenly coated.
• Finish with grated parmesan and serve.