Preheat the oven to 185C / 165C Fan. Butter a 24cm pie dish and scatter lightly with the 1 tsp sugar.
Tip the pitted cherries into the prepared dish and spread in an even layer. Set aside.
In a large mixing bowl, mix together the flour, ground almonds and caster sugar.
Next, add the cream, eggs and vanilla extract and whisk well until you have a smooth batter.
Pour over the cherries and smooth over the top.
Scatter over the chopped butter and sprinkle with the demerara sugar and flaked almonds.
Bake for about 50 minutes - or until the top is puffed up and golden brown and a knife inserted into the centre comes out mostly clean. The middle will still be a bit wobbly, but that’s the nature of a clafoutis (it is better to be just undone rather than overbaked).
Remove from the oven and leave to stand for 10 minutes (there will be a slight dip in the middle, but that is completely normal). Serve warm with a spoonful of mascarpone and a dusting of sieved icing sugar, if desired. Alternatively, leave to cool completely before covering and chilling in the fridge. Then serve cold - it takes on a wonderfully chewy texture. Either way is delicious!