To make the chocolate slices, cream the butter with the spices and orange zest until very fluffy, add the eggs one at a time, add the softened chocolate and cream again until very fluffy.
Sift flour with baking powder and fold into the butter mixture together with the almonds. Spread on a baking tray lined with baking paper and bake at 180 °C in a preheated oven for about 25 minutes.
Dust thinly with flour, place a sheet of baking paper on top and turn out onto a cool baking sheet. Carefully peel off the baked paper.
Allow the cake to cool, divide into small slices and glaze in the dunking mixture softened in a water bath.