Pulse greens in your food processor until they're mostly broken up. Add the walnuts, garlic, lemon juice, cheese, and salt, and process until well combined.
Add the ground pepper, then pour in half the olive oil and blend briefly. Scrape the sides and add the remaining olive oil and pulse again just until combined.
Serve and enjoy!
Notes
Olive oil can take on a bitter or metallic taste when blended at high speeds/temperatures. Most recipes tell you to slowly pour in the oil while processing on low. This isn't an option with my processor, so I just blend briefly in two batches and I never have any problems!