1Slice the lemon into ¼” thick rounds. Stud the slices with the cloves.
2In a large pot, combine the studded lemon slices, red wine, sugar, and cinnamon sticks. With the pot covered, heat the wine slowly and gently over low heat. Heat until just before the wine will simmer and remove from heat immediately. Important: Never let the mixture boil, as that cooks off alcohol in the red wine.
3Let the pot stand, covered, for at least ½ hour to infuse the lemon and spices into the wine.
4Gently reheat before serving. Pour into heat-proof wine glasses and add 1-2 tbsp brandy or Kirsch to each glass, depending upon how much glow you want in your glühwein.