Wash cilantro and squeeze dry in a towel. Place the entire bunch on a cutting board and begin chopping across, starting with leaves. Separate about ½ cup leaves from the top portion and chop coarsely. Place remaining cilantro, including stems, fava beans, peas, and edamame in a food processor and pulse to chop finely. Add chiles, lemon juice, ginger, garlic, curry powder, and salt. Process until smooth. With motor running, slowly add oil. Scrape into a bowl and stir in onion and reserved chopped cilantro leaves by hand.