Combine the water and sugar in a small, heavy saucepan over medium heat. Bring to a boil, stirring to dissolve the sugar. Boil gently, without stirring, for 5 minutes. Stir in the fruit brandy; remove from the heat and set aside.
To serve, preheat the broiler or a toaster oven. Slice the kugelhopf with a serrated knife. Toast the slices, turning once, until lig