Drain the sour cherries from the glass in a colander. The juice can be used for other purposes. Wash the lemon with hot water, rub dry and grate half of the lemon peel on a fine grater.
Beat the eggs with a pinch of salt, cane sugar and 1 tablespoon of hot water for about 3 minutes to a light cream. Stir in lemon zest, vanilla sugar, cinnamon and baking soda. Briefly stir in the cream cheese, low-fat quark and oat flakes. Fold in the cherries.
Line a size 26 springform pan with baking paper. Pour in the dough and smooth it out. Bake in the preheated oven on the middle rack at 180 ° C for 40 - 45 minutes.
Take out the cake, place on a wire rack and let cool down for 10 minutes. Remove the edge of the springform pan and let the cake cool completely.