Mix the butter with sugar until foamy. Then add the eggs and little by little the flour, ground poppy seed and milk. Finally, stir in the bakingpowder and the ground cinnamon thoroughly.
Lean a baking tray with baking paper, pour the batter over it then bake for about 40 minutes.
When cooled, place the cake on a cutting board. Cut it in half lengthwise and smear it with jam, put it on top of each other and press a little.
After an hour of rest cut it into cubes, sprinkle it with powdered sugar and enjoy!
NOTES
The above figures assume a cup with a volume of 250 ml.