In the bowl of a stand mixer, cream the softened fat with sugar and while continuously mixing, slowly add the mixture of eggs and milk. Then we add vanilla sugar and lemon zest. Separately, we sift flour, starch, and baking powder into the mixture, add raisins, and mix the batter again. We slowly mix the resulting batter on low speed to a perfect consistency. We evenly distribute the mixture into greased pans dusted with plain flour, place them in a preheated combi oven, and bake until golden.