Roughly chop the chocolate coating. Put the milk with the butter, 50 g sugar and the espresso powder in a pot and bring to the boil. Remove from the heat, add the chocolate coating and stir until smooth. Add liqueur and stir until smooth. Pour the mixture into praline moulds (3 cm Ø). Then set aside and let it cool down.
In the meantime, caramelise the remaining sugar in a pan until golden. Glaze the hazelnuts in it. Take them out and let them cool down on baking paper. Put 1 glazed hazelnut in each praline. Put the pralines in a cool place for about 1 hour and serve