First cook millet porridge in milk to which you need to add4 deciliters of water. Cook for about 15 minutes to soften and thicken the porridge. Then set it aside and allow cooling.
After this separate the egg whites from the yolks. Beat the egg whites in hard snow. Add sugar to the yolks and beat until creamy. Then add the melted butter (be careful not to get it too hot), rum, lemon zest and vanilla flavoring and stir.
Add chilled millet porridge and raisins to the yolks and stir.
Finally, gently stir in the snow and pour it into a round baking tray (diameter 26 cm) with baking paper underneath.
Bake at 180 degrees Celsius for 35 minutes until the cake rises and gets a bit brown.Sprinkle with powdered sugar before serving.