Apple Teacake

2 eggs, separated
2 cups SR flour
¼ tspn salt
2 tabs melted butter
1 cup sugar
1 large cooking apple
1 cup milk
1 tabs sugar, extra
2 tspn grated orange rind
1 tspn cinnamon

Preheat oven 180°C. Beat egg whites with salt until soft peaks form, gradually add sugar, beat well. Beat in egg yolks, milk and grated orange rind. Fold in sifted flour alternately with melted butter, mix well (mixture at this stage is like a smooth batter). Pour into well greased and lined deep 20cm square cake tin. Peel and core apple, slice thinly, arrange on top of batter. Combine extra sugar and cinnamon, sprinkle over top of apple. Bake 55-60 mins.