1. Preheat the oven to 210°C.
2. Melt 40 g butter in a saucepan.
3. Mix the flour, sugar, salt and vanilla sugar in a large bowl.
4. Add the eggs a little at a time, then the milk a little at a time while continuing to mix.
5. Add the melted butter. Butter the dish, arrange the amarena cherries and pour in the clafoutis mixture.
6. Bake for 10 min at 210°C then reduce to 180°C and bake for a further 20 min.
7. Serve the clafoutis cold or warm, sprinkled with icing sugar.