In a bowl, whisk together the eggs, cream, milk, orange juice, brown sugar, vanilla, orange zest, salt and liquor until blended. Soak the bread slices in the egg mixture for 15 seconds per side.
Heat a nonstick frying pan to medium heat and brush with butter. When the pan is hot, cook the bread in batches (do not overcrowd), turning once, until golden and crisp, about 2 minutes per side.
Transfer the French toast to a baking sheet. Sprinkle 1 tsp. granulated sugar evenly over the surface of each slice. Using a kitchen torch according to the manufacturer's instructions, move the flame continuously in small circles over the surface until the sugar melts and lightly browns. Serve immediately with maple syrup and butter, but try it simple first.
For those that doesn't have a kichen torch, place the slices with the granulated sugar in a oven tray, switch on the grill of the oven untill the sugar melts.