Cream fat, sugar and vanillin sugar. Add the eggs one after the other and stir the mixture until creamy. Mix flour and baking powder, sieve and stir into the egg mixture with 4 tablespoons of milk.
Spread half of the dough into a greased springform pan (26 cm Ø) sprinkled with breadcrumbs. Stir the remaining milk and cocoa into the remaining dough. Spread the dark dough onto the light one.
Use a fork to pull spirally through the dough and smooth it down. Peel and halve the pears. Remove the seeds from the halves and cut the tops of the pears close together lengthwise to about 1 cm deep. Place the halves in the dough with the rounding upwards.
Sprinkle with half of the hail sugar and bake in the preheated oven (electric oven:175 ° C/ gas: level 2) for 50-55 minutes. Stir the jam until smooth, spread on the warm cake surface. Let it cool down.
Sprinkle with the remaining decorating sugar and serve. Makes about 16 pieces.