Drain and rinse chickpeas and put them into a saucepan. Cover with cold water by 2 inches. Add salt and pepper, to taste, smashed garlic cloves and the bay leaves and bring to a boil. Reduce heat and simmer beans until tender, about 45 minutes to 1 hour. Drain, reserving about 1 cup of the cooking liquid. Remove the bay leaves and discard.
Put cooked chickpeas into a food processor or blender. Add the olive oil, lemon juice and zest, whole garlic, and salt and pepper, to taste. Process until smooth; add some of the reserved cooking liquid to thin if, needed. Serve as a base to grilled marinated lamb or put into a serving dish and garnish with a drizzle of olive oil and the parsley.