Heat 1 1/2 litre of milk with vanilla sugar and let the tea bags steep for about 5 minutes. Roughly chop the chocolate. Stir cocoa with 100 ml cold milk until smooth
Remove tea bags from the milk. Melt the chocolate in the hot milk, stir in the cocoa milk. Whip cream until stiff. Divide the chocolate into 8 glasses, place the cream on top as a topping. Sprinkle with grated chocolate and serve immediately