Remove the meringue from the oven and leave to cool. After a few minutes, turn it out onto a sheet of baking paper (hazelnut-side down). Peel away the paper from the base of the meringue and set ...

Add the chocolate, cocoa powder, vinegar and nuts and gently fold into the meringue mixture ... For the sauce, place the chocolate hazelnut spread, butter, double cream and hazelnut liqueur ...