Cook the pasta

• Bring a pot of salted water to a boil and cook the pasta until al dente.
• Reserve a little pasta water, then drain the pasta.

Blend the avocado pesto

• Add the avocado, pine nuts, basil, olive oil, garlic, lemon juice, Parmesan and salt to a blender.
• Blend until smooth and creamy.

Combine and serve

• Pour the sauce into a pan and warm it gently.
• Add the pasta and toss to coat.
• Stir in a splash of pasta water to make it saucy, then serve.