bsudbrink is right! It is called »Feuerzange« - a utensil for preparing »Feuerzangenbowle«
»Feuerzangenbowle« is usually prepared in autumn / winter, when it is cold, wet and dark outside.
You take a pot, fill it with a dry red wine, season it with sliced oranges and lemon, cinnamon sticks, star anise and cloves, then warm it up on the stove (do not cook!).
The most important part: Invite a lot of friends!
Finally, when everyone is gathered around, take your »Feuerzange«, put it over the pot, place a »Zuckerhut« (sugar loaf, lit. "sugar hat") on top, pour some rum - at least 54% alc. (100° proof and above) and light the rum on fire. 80% rum will give you the best result in regard to caramelization of the sugar!
While the sugar slowly caramelizes and melts away, keep on pouring rum with a scoop if necessary, enjoy watching the flames and have a splendid time anticipating the finalization of the »Bowle« together with your friends.
When the sugar has completely melted away, fill into cups and pass it to your friends.
Fun fact: The »Zuckerhut« has been the defacto standard for trading sugar from medieval times up until the 19th / early 20th century.