If you've ever wondered what the royals snack on during the holidays, you're in luck. On Nov. 22, Queen Elizabeth II's official Instagram page shared Buckingham Palace's official Christmas Pudding recipe, and the baking starts . . . now! According to the chefs in the royal kitchen, this dish is traditionally prepared on "Stir-Up Sunday", AKA the Sunday before the Advent season" to be ready by Dec. 25.