|This is a cheat, I used canned artichokes, but aren't the fresh ones pretty?|Put the chickpeas, artichoke hearts, tahini, garlic, and the lemon juice and zest into the bowl of a food processor or a strong blender. Begin processing, and add the water to thin out the mixture. Blend until very smooth, scraping down the sides occasionally. Add the salt and pepper to taste. Spoon onto a shallow bowl, and drizzle the olive oil over it. Serve with pita bread.