Preheat oven to 175 C.
Whip egg whites until stiff.
In a separate bowl, beat ricotta, mascarpone, cornstarch, salt and sugar for about 15 to 20 seconds until mixture becomes fairly creamy.
Add egg yolks and vanilla and beat for another 15 seconds until smooth.
Fold in the whipped egg whites using a spatula, without deflating too much of the air whipped into the egg whites
Pour the filling into the cooled base.
Line springform pan’s exterior with aluminium foil and place in a deep roasting pan.
Pour hot water into the roasting pan.
urn heat down to 150 C and place the water bath setup in the oven.
Bake for 1 hour and 20 minutes or until the top is slightly browned.*
Turn off the oven and crack the door open slightly.
Cool the cheesecake inside the oven for about 30 minutes and then take it out.
Let cool completely before refrigerating uncovered for at least 5 hours.