Pre-heat the oven to 170 degrees Celsius and prepare the pan by greasing it with butter.
Begin by separating the egg whites and yolks into two separate bowls. Divide the sugar evenly between the two bowls.
Whisk the egg whites until they become fluffy and hold peaks, and beat the egg yolks until they turn pale and creamy.
Gently fold the whipped egg whites and flour into the egg yolk mixture in three stages, alternating between the two. This process helps create a light, airy batter. Be cautious not to overmix, as the air in the egg whites is essential for the cake to rise.
For ease of assembly, bake the cake in the same mold you plan to use for layering. Pour the batter into a greased pan and bake for approximately 15 minutes or until a toothpick inserted in the center comes out clean.
While the cake is baking, prepare the milk soak by mixing condensed milk, evaporated milk, and heavy cream. After the cake comes out of the oven, poke holes across its surface and pour the milk mixture over it while still warm. Allow it to absorb the liquid and cool completely.