Preheat the oven at 175 degrees Celsius.
Mix the sugar and the eggs for a few minutes so it becomes white and fluffy.
Mix the flour, potato flour and the baking soda in a bowl, and add it while stirring slowly in the egg mixture.
Butter a baking form and sprinkle some potato flour in the form.
Pour the batter in the form and place in the lower part of the oven for 35 minutes.
Divide the cake in 3 layers.
Whip the cream, and cut the strawberries.
Prepare the vanilla cream according to the description on the box.
Place the bottom layer of the cake on a plate and place half of the vanilla cream on top, repeat with the middle layer of the cake and the rest of the vanilla cream.
Place the top layer of the cake on top and spread evenly the whipped cream on top and on the edges.
Place the chocolate plates all around the cake on the sides..
Spread evenly the strawberries on top of the cake..