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Stir the breadcrumbs with the Parmesan, milk, Italian seasoning, salt, pepper, eggs and garlic until well combined. Crumble in the ground beef, veal and pork. Gently mix just until mixture is evenly combined. Form the mixture into four equal patties.
Select the "Burger" program and press "OK" . Lightly grease the cooking plates with cooking spray. Once the purple indicator light has stopped flashing, place the patties on the grill and close the lid.
Cook until the indicator light has changed to the colour red. Spread half the marinara sauce evenly over the bottom of the Kaiser halves and top each with a patty. Spoon the remaining sauce over the patties and sprinkle with cheese; cap with the remaining Kaiser halves.
Tips: Add sautéed mushrooms, onions and peppers for an authentic Italian sandwich. Serve the burgers with a side of sautéed rapini or wilted spinach. Omit the veal and pork and replace with all beef for an equally delicious burger.