In a food processor, combine the chickpeas, water, tahini, 5 tablespoons lemon juice, salt, and garlic and puree. While the motor is running, pour in the olive oil and process until fully incorporated. Season with pepper, to taste. Store in the refrigerator for 6 hours, for the flavors to come together.
When ready to serve, remove the hummus from the refrigerator and stir in the remaining 2 teaspoons lemon juice and parsley. Transfer to a serving bowl or platter and drizzle with olive oil. Serve with flat breads and olives. Store any leftover hummus in the refrigerator for up to 2 days.
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