Grease 24cm springform and cover with a thin layer of breadcrumbs.
2. Using an electric mixer, whip together butter and half of the sugar until fluffy. Stir in egg yolks and continue whipping. Add flour and salt.
3. In a large bowl, beat egg whites to soft peaks. Add the remaining sugar.
4. Gently fold the egg whites into the butter mixture using a spatula or wooden spoon.
5. Scrape the batter into prepared springform and cover with cherries.
6. Bake in 180C (fan forced) for 40 min. Sprinkle with vanilla sugar when cooled