Preheat the oven to 190° traditional heat. Generously butter a ceramic mold or other thick mold 22-23cm in diameter. Optionally, you can also sprinkle it with sugar.
In a bowl, beat the eggs, brown sugar and vanilla. Then add the flour and salt and whisk until you have a smooth mixture without lumps.
Then add the melted and lukewarm unsalted butter, then the liquid cream and the milk in two batches. The batter is very runny, like pancake batter, that's normal.
Peel, core and cut the apples into strips (neither too thick nor too thin). Then place them on the bottom of the mold.
Pour the clafoutis batter over the apples. Bake for about 40-50 minutes (this varies depending on the oven, so watch out): the top should be golden. The clafoutis rises like a soufflé while cooking and then resumes its size when it comes out of the oven.
Let cool on wire rack. Add a veil of icing sugar before serving. This clafoutis can be eaten warm or cold.
Notes
This clafoutis is best eaten on D-Day.It keeps for 2 days at room temperature. It can also be stored in the fridge in an airtight container for about 4 days. It will then be better slightly reheated for a few seconds in the microwave.