Make the crust: Mix flour, sugar, and salt. Cut in the cold butter until crumbly. Add egg yolk and mix to form a dough. Chill for 30 mins.
Prepare the tart base: Roll out the dough, press into tart pan, prick the base with a fork, and pre-bake for 10 minutes at 375°F (190°C).
Slice the apples: Peel, core, and thinly slice the apples.
Arrange the apples: Layer the slices neatly over the pre-baked crust.
Make the custard: Whisk cream, sugar, egg, yolk, and vanilla. Pour over the apples.
Bake: Bake at 350°F (175°C) for 40–45 minutes, until custard is set and apples are tender.
Glaze: Warm apple jelly or apricot jam and brush over the tart for shine.
Cool and dust: Let cool, then dust lightly with confectioner’s sugar before serving.