Preheat the oven to 170°C (338°F).
In a bowl, add eggs and sugar, then warm them over a double boiler.
Whip with a hand mixer until the mixture becomes light and fluffy.
Sift in the cake flour and gently fold together.
Add the melted butter and milk, and mix evenly.
Pour the batter into a cake pan.
Bake in the oven for 30 minutes.
Once completely cooled, remove from the pan.