Bring butter, sugar and cream to the boil and simmer
for 3 minutes. Add the liqueur and the orange peel. Serve hot on
Cut the vanilla pod in halves and take the inside
out with a knife. Bring the milk to the boil with the outside and inside
of the vanilla pod and simmer for 15 minutes. Whisk the egg yolks with
the sugar and slowly add the hot milk. Heat this mixture on very low
heat while stirring all the time, until the sauce thickens. be careful
that it does not boil! Allow the sauce to cool down.