Pour the red wine into a large pot or heatproof bowl.
Slice the oranges (one peeled and one unpeeled) and add them to the wine.
Add the cinnamon stick and cloves to the mixture.
Heat the wine gently over low heat, ensuring it does not boil to preserve the flavours.
Place the pot or bowl on a heatproof stand, using two tealights or a low flame burner to keep it warm.
Position the sugar cone securely on a Feuerzangenbowle clamp or a metal rack above the wine.
Slowly pour a small amount of the rum over the sugar cone, soaking it thoroughly.
Carefully light the rum-soaked sugar cone using a long match or lighter. The sugar will begin to melt and drip into the wine.
Gradually add more rum to the sugar cone as needed to maintain the flame until the sugar cone is fully melted. Use a spoon to avoid setting the bottle on fire!
Stir the wine gently to mix in the caramelised sugar and spices evenly.
Ladle the hot Feuerzangenbowle into heatproof glasses or mugs and serve immediately.