In a medium bowl, combine ground duck, Worcestershire sauce and egg and mix evenly. Combine next 6 ingredients and mix evenly. Cover and refrigerate for 1 – 2 hours. Sprinkle flour over mixture (to help bind them) and form into 4 – 6 patties. Heat some olive oil in a large, heavy-duty skillet over medium heat. Brown on both sides, about 3 minutes each, or until cooked to desired doneness. Top with cheese until melted and serve immediately.