Note:Preheat BBQ to medium-high or the oven to 425 °F (210 °C).
Place veal, mustard, honey, chives, egg and bread crumbs in a mixing bowl. Season to taste, combine and divide preparation into four to six parts. Shape into patties and reserve.
Place oil and vinegar in a mixing bowl. Season to taste. Add onion and peach slices. Toss until coated with mixture.
Place patties, onion and peach quarters on grill or on parchment-covered baking sheet in center of oven. Grill onion and peach to taste. Cook burgers 12-15 minutes turning them over once.
Heat burger buns. Add Canadian Brie and let melt for 2 minutes.
Assemble burgers, garnish with onion, peach, lettuce and serve.
Tips: You can also cook the burgers in a skillet over medium-high heat, 5 to 7 minutes per side.