Squeeze the oranges and lemons. Heat the juices, red wine and spices (not the sugar yet!) Together in a large saucepan, but do not let them boil! Pour into the cups so that there is still a finger`s breadth of space to the edge. Keep the rest warm.
Place fire tongs or a large teaspoon across the mug. Place two sugar cubes on top. Slowly pour approx. 2 - 3 cl rum over them. Light the soaked sugar with a match. Now the sugar will caramelize with a little blue flame. If the flame goes out or the sugar has dissolved, slide a spoon into the mug and stir.