In a saucepan, melt the butter, add the apples (previously peeled and diced), add the sugar and cook for about 10-15 minutes, add the grated lemon zest, mix and set aside.
For the cream: mix the egg yolks, pour in the milk, mix again.
Melt the butter, add the cornstarch, mix, and boil for 1 minute.
Take the pot off the stove, gradually pour the milk mixture, stirring until homogeneous each time.
Add sugar, return the saucepan to the stove and cook until thickened, add vanilla extract, stir again.
Assemble the pudding:
Add the apple mixture to the base of a 20 cm diameter baking dish and spread it out.
Pour the cream on top.
Uniformly cover with sugar and cinnamon on top.
Bake for 5 minutes in the oven, temperature 200 °C, let cool for 15 minutes.
Serve the pudding while it's still warm.
Enjoy your meal.