Add 2 egg yolks, 10g sugar, 15g of cake flour, and 150ml semi-skimmed milk into a mixing bowl and stir thoroughly.
Prepare a water bath by filling water into a pot and cover it with the mixing bowl.
On low to medium heat, keep stirring the ingredient (from Step 1) until it thickens.
Add 30 g of chopped butter pieces onto the bowl and mix.
Add grated lemon zest (from 1 lemon) and 2tsp of lemon juice. (Adjust the sourness according to your preference!)
In a separate mixing bowl, add 2 egg whites and 20g sugar and beat the whites until stiff peaks.
Fold the whipped egg whites into your yolk mixtures ( in 3 rounds).
Line a cake tin with baking paper (2 strips + 1 circle of parchment paper) and wrap with aluminum foil (for water bath).
Pour the batter into your cake tin.
Bake your cheesecake in a 'water bath' in the oven preheated to 160 °C for 20 minutes.
Reduce oven to 150 °C and bake for another 45 minutes.
Topped your cheesecake with apricot jam diluted with water (same ratio, i.e. 1 tbsp water with 1 tbsp apricot jam) and let it chilled overnight in the fridge.
Decorate your cheesecake with berries of your choice and it is ready to be served!