Add the chickpeas, pesto, tahini, lemon juice, and sea salt to the food processor, and process until very smooth and creamy. If the hummus is too thick and not a good creamy consistency, add 1-2 tablespoons more olive oil or water to thin it out.
Grate in garlic (if needed, depending on how much garlic was in the pesto). Taste the hummus, and adjust seasonings to preference (more lemon juice, salt, or garlic, if needed).
Chill the hummus prior to serving. Serve with a variety of cut vegetables, crackers, pita, or more! See serving suggestions below.
How to Garnish Hummus: Smooth the top of the hummus out, leaving a swirl around the edges. Drizzle with olive oil, and garnish with pine nuts, chopped walnuts, additional fresh basil leaves, reserved chickpeas, or cracked black pepper.