While the broccoli roasts and the pasta cooks, prepare the pesto. Combine all of the ingredients in a food processor or high-powered blender (I used my
Vitamix). Pulse on low speed until the ingredients come together. Make sure to scrape down the sides if you’re using a food processor. If you’re using a blender, keep the motor on low and use a tamper/scrape down the sides to make sure your pesto doesn’t become too smooth and pureed. You want the ingredients broken up into little bits, but not completely smooth. Taste, and adjust salt, pepper, and lemon to taste. If you want it thinner, you can add more olive oil or switch to filtered water - I ended up adding about ¼ cup of water to get it to my desired consistency.