Shell the fava beans, blanch them in boiling water for 5 minutes. Shock them in cold water then peel the outer shell off. The beans should come out to be about 1 cup (not much compared to the 2 lbs you just bought). Combine the beans, Parmesan, garlic, cilantro, lemon zest & juice, and blend in a food processor. While blending, slowly drizzle in the olive oil. After, add salt and pepper to taste.