In a food processor or blender add the arugula, parmesan and pecorino cheese, salt, chopped garlic, pine nuts and 1/4 cup olive oil to start.
Blend ingredients on medium speed until it starts to combine, then add another 1/4 cup of olive oil and blend again for approximately 30 seconds, then add a tablespoon or 2 of the remaining olive oil until you reach your desired thickness.
Mix with cooked pasta, sprinkle with grated Parmigiano Reggiano. Enjoy.
Notes
If you want a stronger taste of arugula, cut back on your Parmigiano by about a tablespoon.
Leftover pesto can be refrigerated for up to 3 days or frozen. Keeping a thin layer of oil on the top helps to keep the pesto from oxidizing.This recipe comes from An Italian In My Kitchen.