Cookies are milled and mixed with the melted butter. Optional pipette little rum flavoring. Spread on the bottom of the pan and squeeze well. In saucepan over low heat melt chocolate with 150 ml liquid pastry cream. Stir until chocolate is completely melted. Allow to cool a bit. Separately mix to more 400 ml liquid pastry cream and add the melted chocolate. Still may preach chocolate or rum flavoring optional. The cream is poured over biscuits, smoothed and put in the fridge for 2-3 hours. Before serving can be dusted with cocoa, coconut, Nescafe, grated dark chocolate or other optional.