Dice the cream nougat tree trunk. Put the cream and milk in a saucepan. Stir in sugar, egg, egg yolk and pieces of tree trunk and gently warm them, stirring constantly, but do not boil.
When the ingredients have dissolved, beat with a hand mixer with a whisk for about 5 minutes, so that a homogeneous mass is formed. Add vodka and rum and whip for another 1 - 2 minutes.
Fill into bottles and store in a cool place. The liqueur will keep well chilled for a week.