Grease six ovenproof cups or metal moulds (each containing 150-200 ml) and dust with flour. Put them in a cold place.
Break all the chocolate into pieces and melt in a pot with butter. Beat the eggs, egg yolks and sugar with the whisk of the hand mixer for 5-8 minutes until thick and creamy. Slowly stir in liquid chocolate.
Fold in flour. Spread the chocolate mixture into the cups and chill for about 1 hour.
Chop the pistachios. Peel and slice the mandarins. Mix honey and liqueur. Mix with pistachios and mandarins.
Bake the chocolate cakes in the preheated oven (electric oven: 200 °C/circulating air: 175 °C/gas: level 3)for 12-15 minutes. Allow to rest briefly in the moulds, then turn out onto dessert plates. Arrange with mandarins and sprinkle with sugar pearls and icing sugar.