Roast the hazelnuts in a pan without fat. Rub the skin vigorously in a sieve with kitchen paper. Coarsely chop the couverture. Dice the nougat and butter and melt with the couverture in a hot water bath while stirring. Stir in spices, then fold in hazelnuts, almonds and pistachios
Line a square form (e.g. casserole dish; approx. 22 x 22 cm) with baking paper. Pour in nut chocolate and spread with a tablespoon in a wavy shape. Leave to set overnight in a cool place (not in the refrigerator!)
Turn out the chocolate from the mould, remove the baking paper. Cut the chocolate into cubes and sprinkle with chopped pistachios. Store in a cool place