Mix the margarine, eggs, sugar with vanilla sugar until frothy. Mix the flour with baking powder and stir in a tablespoon at a time. Add milk in sips. Make sure that the dough does not become too runny. Possibly take less. Crush 100 g couverture or chocolate with a knife and add to the batter, stir. The dough should fall off the mixing spoon and tear easily and spread well.
Half of the dough is poured into a greased and floured 28-inch springform pan. Place the prepared, peeled, pitted and quartered pears in the batter in a wreath shape. Pour the other half of the batter over it. Bake at 190 ° C for about 1 hour in the preheated oven on the lowest rack.
After baking, let the cake cool down a little. Then brush the edge of the cake with couverture with a brush.
Drizzle the rest of the couverture onto the cake with the still liquid couverture and create a pattern on it. Put the marzipan mixture in small, plucked pieces on the chocolate decoration.