1. In food processor combine chickpeas, onion, garlic, parsley, flour, cilantro, cumin, salt, red pepper, and black pepper. Pulse until combined and mixture comes together, about 10 pulses.
2. Put 5 sheets of paper towel on the counter. Put mixture on towel and squeeze out excess liquid. If more comes out, you can use more paper towels. Shape into 4 patties using your hands.
3. In medium nonstick frying pan, add vegetable oil and heat to medium-high. Cook patties until golden brown underneath, about 4 minutes. Flip and cook on the other side until browned, another 4 minutes. Remove from pan and place on plate while preparing sauce.
4. Combine Greek yogurt, garlic, shredded cucumber, lemon juice, salt and pepper in a bowl. Spread on the tops and bottoms of each of the hamburger buns.
5. Place the patties in the buns and top with feta, tomato, red onion, and lettuce.

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