Preheat the barbecue or broiler.
Place the burger ingredients in a large bowl, blend the mixture with your hands, taking care not to overwork it.
Form the mixture into 8 long oval shapes, about 1 inch thick.
Chargrill, broil or fry the burgers for about 5 minutes on each side for rare, or to your taste.
Split the rolls or pita breads without cutting them through. Remove some of the bread from the center of the rolls.
Place some tomato and shallot slices in the rolls, add the burgers, and garnish with flat-leaf parsley, fresh cilantro and Greek-style yogurt.
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