For the groats, stir 4 tablespoons of mulled wine with starch until smooth. Bring 125 ml mulled wine to the boil. Stir in the starch and simmer for about 2 minutes while stirring. Add 50 g sugar and frozen berries. Let it cool down and put it in a cool place.
For the stollen knights mix 50 g sugar and 1⁄4 teaspoon cinnamon. Whisk eggs and milk. Turn the Stollen slices in it one after the other. Heat butter in 2 portions in a wide pan.
Fry half of the Stollen slices for about 5 minutes on each side, turning once. Take out and turn in cinnamon sugar. Arrange the poor Stollen knights with Christmas grits. If you like, serve vanilla ice cream with it.