Place bread in food processor; pulse until coarsely ground. Combine breadcrumbs, onion, and the next 7 ingredients (onion through garlic) in a bowl. Divide mixture into 4 equal portions, shaping each into a 1/2-inch-thick patty.
Place patties on grill rack coated with cooking spray, and grill 7 minutes on each side or until done. Serve with Cucumber Sauce.
Agree with the previous reviewer - this has potential, but could use something extra... next time I may try putting some feta in the burger mix. I made the cucumber sauce with dill, not parsley, and added some lemon juice - delicious!
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