Anke's personal recommendation:
In our family the recipe is refined by whipped egg white, pour this over the alcohol and then pour hot milk over it.
I wish you a wonderful St. Nicholas weekend
Recipe egg grog
1 egg yolk
1 - 1 1/2 teaspoon sugar
4 cl arrack
4 cl rum
Beat the egg yolks with sugar in a 0.5 liter glass of egg yolk until foamy.
Add rum and arrack, whip briefly.
Fill up with boiling water so that the foam rises to the top.