Melt the butter in a saucepan over low heat. Roughly chop the chocolate, add and melt in the butter, stirring constantly.
Take the pan off the stove and add the condensed milk in a thin stream while stirring. Stir until it has a creamy consistency. Stir in the desiccated coconut. Add the grated tonka bean and stir in.
Pour the cream into clean jars with screw caps and allow to cool.