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)
4-8tbspextra virgin olive oil
Salt to taste
Juice of 1 lemon
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.
You can add more or less olive oil, per your preference. For a runnier pesto, you'll want to use more oil.