Preheat oven to 425 degrees. Whisk together milk, egg yolks and lemon rind. Soak break slices in egg mixture until saturated. Whisk egg whites until frothy. Dip soaked bread in whites and then dredge in bread crumbs. Arrange on greased cookie sheet and bake for 15 minutes. Remove, turn over and return to oven for 10 minutes longer. While toast is baking, place apple slices in small saucepan with the 2 cups water and lemon juice. Bring to a boil and remove from heat. Saute bratwurst and onions together until crispy brown. To serve, sprinkle toast with sugar/cinnamon mixture, cover with cooked, drained apple slices, sauteed bratwurst and onions. Serve with maple syrup. Makes 8 servings.