Combine everything except the olives in a food processor and whirl for 2 minutes until smooth. Add a few teaspoons of water if you need to smooth it out. It should be a bit thinner than a pesto.
Toss a few tablespoons of the green harissa with the olives and marinate for a few hours before serving.
Notes
Make sure and let these marinate for a few hours before serving. Days is fine, even!