Preheat oven (electric cooker: 180 °C/circulating air: 160 °C/gas: see manufacturer). Grease the springform pan (26 cm Ø). Mix 100 g butter, vanilla sugar, 200 g sugar, orange zest and 1 pinch of salt with the whisk of the mixer for about 2 minutes. Add the egg and continue stirring for about 1 minute. Mix flour with baking powder and stir in alternately with buttermilk.
Smooth the dough in the form. Mix the frozen cherries with starch and spread on the dough. Sprinkle 2 tablespoons of sugar over the cake. Bake in a hot oven for 50-60 minutes, covering with foil after about 40 minutes if necessary.
Take out the cake, let it cool down and carefully remove from the mould. Dust with icing sugar as desired.
Before baking, mix the sugar with 1 teaspoon of cinnamon for sprinkling.