2. Heat the oil in a large, non-stick skillet. Add the onion, pepper, garlic, tomatoes and cumin and cook over high heat until lightly browned and dry, about 3 to 5 minutes. Stir in the tomato paste, parsley, chickpeas and potatoes and simmer for a few minutes. Season with salt, pepper and cayenne to taste. Let the mixture cool to room temperature.
3. Coarsely puree the chickpea mixture in a food processor, adding the breadcrumbs as a thickener. (Run the machine in short bursts and don't over-process.) Wet your hands and form the mixture into 8 patties. Arrange the patties on a plate spread with plastic wrap and chill for at least 3 hours.
4. Grill the burgers as described above, spraying the vegetable grate with cooking spray. Alternatively, arrange the burgers on an oiled, non-stick baking sheet, lightly spray the tops with oil and broil. To sauté, add a teaspoon or 2 of oil to a non-stick skillet. Cook the burgers over medium heat until crusty. Whichever method you use, you'll need about 4 to 6 minutes per side cooking time. Turn the burgers with a spatula as gently as you can.
5. Serve the burgers on rolls with onions, tomatoes, lettuce and your favorite condiments.