1. Put peeled avocados, lemon juice, olive oil, pine nuts, crushed garlic cloves, basil leaves, salt and pepper in a food processor. Blend until smooth. Set aside. 2. Bring a large pot of salted water to a boil. Add the pasta and cook according to package directions. Drain the pasta and transfer to a large bowl. Keep 1/4-1/2 cup of the cooking water. 3. pour the avocado sauce to the pasta. Add 1/4 cup (or more) cooking water to the bowl and stir until combined. Serve immediately. 4. Top with grated parmesan (optional).