japanese cotton cheesecake

i'd try this recipe and its perfect !

Ingredients:
140gm icing sugar
6 egg whites
6 egg yolks
1/4 tsp cream of tartar
50gm butter
250gm cream cheese
100mlfresh milk
1 tbsp lemon juice ( I also add in 1/2 lemon rind )
60gm cake flour ( I used self raising flour )
20gm cornflour
1/4 tsp. salt

Method :
1. Melt cream cheese, butter and milk over a double boiler. Cool the mixture. Fold in the flour, cornflour, egg yolks, lemon juice, lemon rind, salt and mix well.
2. Whisk egg whites with cream of tartar until foamy. Add in the sugar and whisk until soft peaks form.
3. Add the cream cheese mixture to the egg white mixture and mix well. Pour into a 9-inch round springform pan (Lightly grease and line the bottom and sides of the pan with greaseproof baking paper or parchment paper).
4. Bake cheesecake in a water bath for 1 hours 10 minutes or until set and golden brown at 140 DC.