Gather the ingredients.
Preheat the oven to 400 F (200 C).
Peel, core, and thinly slice the apples.
Place the slices in a bowl and toss gently with the sugar and cinnamon.
If the apples start to brown, you can toss in a tablespoon of lemon juice.
Roll out the pastry and fit into a 9-inch tart pan, trimming the excess dough.
Spread the pastry cream across the bottom of the pastry shell.
Arrange the apple slices in a pattern over the pastry cream and dot the apples with tiny bits of butter.
Wrap strips of aluminum foil around the edges of the tart pan to protect the crust from burning.
Bake the tart in the preheated oven for about 40 minutes.
Remove the foil, and continue baking for another 10 minutes, or until the apples and crust are nicely colored.
Remove the tart to a rack to cool.
While the tart is still warm, heat the apricot jam with the lemon juice until boiling.
Strain the mixture.
Then use a pastry brush to apply the apricot glaze over the apples.
Refrigerate the tart when it has cooled completely.
Serve chilled or at room temperature.