Directions

1. Combine half the chickpeas, the onion, lemon juice, 4 teaspoons water, zucchini, cayenne, cumin, coriander, baking soda, salt, and pepper in a food processor. Process until smooth. Transfer mixture to a large bowl. Add remaining chickpeas to processor, and pulse just until lumpy (should still have some texture), six to eight pulses. Stir into chickpea mixture. Stir in the herbs.
2. Use your hands to pat the mixture into twelve 2-inch patties, each weighing about 1 1/2 ounces. Place each on a waxed-paper-lined baking sheet. Cover with plastic wrap, and transfer to refrigerator for 30 minutes.
3. Spray a nonstick skillet with cooking spray. Place skillet over medium heat, and cook three to four patties at a time, until golden brown, 3 to 5 minutes on each side. Transfer cooked patties to a heatproof plate to keep warm in a 200 degrees.oven, if necessary.
4. To serve, toast pitas, and split them open. Arrange lettuce, tomato, and red-onion slices on each. Place two of the cooked patties on each pita. Sprinkle each with mint leaves. Serve with Tzatziki.