Preheat the oven to 180 ° C (150 ° C with hot air). Grease the baking dish well.
Beat the butter and sugar until frothy. Sift the flour and add to the butter-sugar mixture. Stir until it becomes crumbly. Distribute the dough evenly in the baking dish and bake on the middle rack for about 15-20 minutes until it is golden brown.
For the caramel filling, put all the ingredients in a saucepan and heat slowly until the sugar has dissolved. Then stir for approx. 5 - 10 minutes, stirring constantly. Quickly distribute the mass on the prepared base and let it cool down well.
Melt the chocolate over a water bath at low temperature and pour it onto the cooled caramel mixture. Before the chocolate becomes too firm, score lightly with a knife and then divide into portions. Attention! The shortcakes are very powerful and should be cut into small pieces.
Put in the fridge for at least an hour before serving.