Cream butter, sugar, 1 pinch of salt, vanilla and egg liqueur with the whisks of the mixer. Add the flour and almonds and work into a smooth dough with the dough hooks of the mixer.
Shape the dough into approx. 35 balls and place on a large plate to cool for approx. 2 hours.
Take the balls out of the fridge. Roughly chop the couverture and melt in a hot water bath. Use a fork to coat the balls with chocolate coating all around. Drain briefly, place on a board or tray lined with baking paper and chill for about 15 minutes.
Put the cocoa in a deep plate. Roll chocolate balls in it so that they are completely coated with cocoa. Possibly tap the cocoa a little.