Preheat the oven to 190 ˚C. Grease the cake tin with butter.
Remove the papery husk from the physalis berries and rinse them. Arrange the berries over the base of the cake tin.
Melt the butter in a saucepan. Sieve the flour into a bowl and mix with 1 pinch of salt, the sugar and cinnamon. Add the eggs, milk and melted butter and beat with the mixer. Add the vanilla extract last and beat again. Continue beating until the batter is smooth. Pour over the berries.
Place the clafoutis in the middle of the oven and bake for 30 minutes until golden and cooked. Serve lukewarm.
