1. Line the bottom of a rectangular cake form with parchment paper.
2. Beat the egg yolks with the sugar until you get a light and bulky egg yolk.
3. Mix the baking powder with the potato starch, add to the egg yolk and beat a little more.
4. Add the lemon juice and incorporate well in the dough.
5. Beat the egg whites until firm and fold them into the dough with a spetula.
6. Bake in preheated oven at 180ºC or 350ºF for about 25 minutes.
7. Let it cool and unmold.
8. Cut the cake into two identical slices so you have a bottom piece and top piece.
9. Beat the cream with the sugar and the lemon juice until it forms peaks.
10. Add a layer of yogurt and pineapple cut into small pieces on top of the bottom piece.
11. Place the top piece of the cake on top and spread the cream mixture on top and around the cake.
12. Decorate with the fruits of choice.

Adapted from a Recipe by: tentacoesobreamesa.blogspot.com