In 500 ml of milk, mix crystal sugar and packet of vanilla sugar and bring to a boil. With the remaining milk, mix cornstarch and egg yolk, then add to the boiling milk. Simmer 1-2 minutes, constantly mixing, until the sauce thickens.
Add the chestnuts and grated chocolate and mix well. Pour the cream into wide dessert glasses. After it cools, add orange marmalade.
Optional: Instead of orange marmalade, add slices of orange and sprinkle with brandy.