¼cupunsalted pumpkin seeds(you can use salted, but dial down the added salt in that case. You can also use nuts like walnuts, pecans, cashews or pine nuts)
Place all the ingredients except the oil in a food processor except the olive oil. With the blade running, drizzle in the olive oil until you have a coarse paste. Check for salt and pepper and add more if needed.
Notes
You can add more or less olive oil, per your preference. For a runnier pesto, you'll want to use more oil.