Prepare the Broccoli Rabe:

Bring a large pot of salted water to a boil. Add the broccoli rabe and garlic, cooking for 2-3 minutes until bright green and tender.

Immediately drain and set aside.

Cook the Pasta:

In the same pot of boiling water, cook the pasta according to package instructions until al dente. Drain the pasta, reserving about 1/2 cup of pasta water.

Make the Pesto:

In a food processor or blender, combine the cooked broccoli rabe, walnuts, garlic, Parmesan cheese, lemon juice, salt, and pepper.

Slowly drizzle in olive oil while blending until smooth. If the pesto is too thick, add reserved pasta water to reach the desired consistency.

Combine the Pasta and Pesto:

Toss the cooked pasta with the broccoli rabe pesto in a large bowl. Add more reserved pasta water as needed to coat the pasta evenly with the pesto.

Serve:

Divide the pasta into serving bowls. Garnish with extra Parmesan and a drizzle of olive oil. Serve immediately.