Preheat the oven to 170°C/340°F.
Line and butter a 26cm spring form pan.
In the bowl of your mixer, break the eggs, add the sugar and salt.
On high speed and with the whisk attachment beat the mixture until light and fluffy and the batter falls on top of each other when you lift the whisk and does not disappear. This will take 10 to 15 minutes. Do not rush this step, you want to aerate the eggs fully.
Sift the flour in 3 additions into the batter and fold carefully.
Pour the batter into your prepared pan and do not smooth the top. It will level itself in the oven.
Bake for 40 minutes or until a toothpick inserted comes out clean. Just do not open the oven door for the first 30 minutes as you do not want the cake to sink.
When it is done, turn the oven off and let it cool for 10 minutes in the oven with the door ajar, then take it out and cool completely. If it sunk a bit, you may invert the cake pan onto a wire rack.
You may make the cake one day ahead. Wrap well in cling film and store in the refrigerator. May also be frozen up to 1 month.