First prepare a sugar caramel and a few drops of water. Pour into a saucepan.
praline : caramelize the sugar with a few drops of water, then add the walnuts, mix well to cover all sides with caramel, then pour over a glass plate greased very well with butter or margarine. Allow to cool very well, then break the praline into pieces or crush with a rolling pin.
Peel the apples, then cut them in half and remove the stalks. Place the hollows in the pan over the caramel. The empty spaces between them are filled with apple slices. Put the jam over them and the praline nut. Place the dish in the oven until the apples have softened.
Quickly prepare the dough for the countertop: beat the egg whites hard with the sugar. Then add the yolks rubbed with oil, water and vanilla essence. Mix everything at low speed. Lightly put the flour and baking powder sifted together.
Pour the composition for the countertop over the ripe apples and put the dish in the oven until it is well cooked. The toothpick test is done after 25 minutes.
Leave the cake to cool until the next day when it is syrupy, and turn it over on a plate and then garnish it with imagination with whipped cream and praline.