Created by ImPat on February 6, 2020
Step 1: Place cornflour, custard powder and 1/3 cup caster sugar in small saucepan and whisk in 1 1/3 cups milk and egg yolks in a large jug.
Step 2: Gradually whisk milk mixture into cornflour mixture until smooth and then place over low heat and whisk constantly until custard boils and thickens.
Step 3: Remove from heat; cover surface directly with plastic food wrap and let cool.
Step 4: Preheat oven to 160°C (140°C fan-forced).
Step 5: Grease and line a 21x10cm loaf pan with baking paper, extending paper at long sides for handles.
Step 6: Using an electric mixer, beat butter, extra sugar and essence in a medium bowl until light and creamy and then add eggs, one by one, beating well after each addition.
Step 7: Fold in flour and extra milk and then spoon mixture into prepared pan and then spread half the cooled custard over cake mixture.
Step 8: Peel and quarter apple, then slice thinly and arrange apple over custard and sprinkle with demerara sugar and then bake for 55-60 minutes or until a skewer inserted at centre comes out clean and then let cool in pan for 10 minutes and then transfer to a wire rack to cool.
Step 9: Cut into slices to serve.
Step 10: Warm remaining custard and whip cream until soft peaks form; fold into custard and serve cake with custard.