INGREDIENTS

35g butter
120g mascarpone
20ml milk
4 egg yolks
6ml lemon juice
1g salt
2ml vanilla extract
40g (1/3 cup) cake flour 
15g corn starch
125ml egg whites
85g (3/8 cup) sugar 
2ml lemon juice
Powdered sugar

METHOD

1. In a bowl of water, bathe and adds butter and mascarpone. Add in egg yolks, salt, and vanilla extract, and sift in corn starch and flour.
2. In another bowl beat egg whites with sugar and lemon juice. Mix everything together.
3. Transfer to the baking pan and put it into another bigger pan with hot water.
4. Bake at 180°C (360°F) for 15 minutes, and 140°C (284°F) for 80 minutes.
5. Sprinkle with powdered sugar.