Preheat the oven to 350 F (180 C)
Sift together the flour, baking powder, powdered sugar and salt.

Sprinkle with lemon zest. Incorporate the butter so that the mixture resembles coarse flour.
Grease a 9-inch (23 cm) round mold with removable sides.
Put the dough in the mold and flatten it by tapping on it.

Bake the dough for 15 or 20 minutes or until it is slightly golden brown.

In a bowl, mix the sugar and nutmeg, then add the apple slices and mix well so that the apples are well coated.
Arrange the apple slices on the dough.
Sprinkle with butter flakes.

Beat the egg yolks and cream.
Pour the preparation over the apples.
Bake for 45 minutes or until the crust is golden brown and the fruit is tender. Serve warm or cold. Cut into wedges.