1
Preheat the oven to 175°C. Whisk the egg whites and sugar on high speed for about 5 minutes, or until stiff peaks form. Stir the dry ingredients and slowly add them to the beaten egg whites with a spatula. Spread the mixture on a 16 x 26 cm baking tray lined with baking paper (bottom) and bake for 18 minutes. Cool for a few minutes in the baking tray before removing from the tray and cooling on a wire rack. Cut the cooled sponge cake crosswise into two equal layers.
2
While the sponge cake is baking, make the vanilla custard by bringing 4 dl of milk to the boil; mix the remaining milk smoothly with the pudding powder, egg yolks, sugar and vanilla paste. Pour the mixture into the boiling milk and cook for a few minutes, stirring constantly, until the custard thickens. Remove from the heat, add the butter, cut into sheets and stir to combine. Cover with plastic wrap and chill until lukewarm.
3
Whisk the mascarpone cheese, add the coconut spread and mix well. Blend the cooled vanilla cream with a hand mixer until smooth. Add it to the mascarpone cheese in three steps, mixing each time with a hand mixer.
4
Place the bottom of the sponge cake on the base, moisten it and place the frame. Brush it with a good half of the cream and smooth the surface. Place the other part of the sponge, top side down, on top of the custard, moisten it and spread the rest of the custard over it. Level the surface and sprinkle the cream with coconut flour.
5
Chill the slices for at least 6 hours. Cut into cubes and decorate as desired.