Add the milk, and small pieces of torn up cheese into a small saucepan.
Heat it up over medium-low heat until right before it starts to boil.
When the cheese has melted, mix well with a wooden spatula.
Let the mixture cool down.
Separate the egg yolks and egg whites.
Add the egg whites, 1/2 of the sugar into a bowl, and whip into a firm meringue.
Add the egg yolks and the remaining sugar into a separate bowl, and mix with a whisk.
Add the Step 1 mixture, and mix well.
Sift the cake flour into the Step 4 bowl, and mix well with the whisk.
Add the lemon juice as well, and mix well.
Add 1/3 of the Step 3 meringue into the Step 5 bowl, and mix well with the whisk.
Add the remaining meringue, and mix well with a spatula.
Pour the batter into a cake pan lined with parchment paper.
Place it in a baking sheet filled with hot water in the preheated oven, and bake for about 50 minutes at 160C.
Cover with aluminium foil halfway through so that it won't get burned.
If you don't mix the mixture really well during Step 6, it will separate into 2 layers, so please be careful.
If you are using a cake pan with removable bottom, the hot water will come into the pan while steam-baking in a water bath during Step 8, so please cover the bottom with aluminium foil and bake.