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In a medium bowl, mix sugar and yolk of eggs.
Work on the eggs for several minutes, so the cake will be softer.
Add melted butter, flour, potato flour and baking powder.
Separately mount the four egg withes until stiff and then add them to the mixture.
Cover a rectangular pan with parchment paper and put in the mixture.
Put in preheated oven at 180 for 15 minutes. Remove the cake from the oven and sprinkle it with pineapple juice.
Sprinkle the surface of the cake with jam. If you prefer chocolate: sprinkle the cake with alchermes and chocolate cream.
Gently, roll up the cake and decorate it with icing sugar.