Ingredients
Custard
Method
1.To make custard; combine custard powder and sugar in small saucepan; gradually stir in milk. Cook, stirring, until mixture boils and thickens slightly. Remove from heat; stir in butter and extract. Press plastic wrap over surface of custard to prevent a skin forming; cool. Whisk until smooth before using.
2.Preheat oven to 180°C. Grease deep 20cm round cake pan; line base with baking paper.
3.Beat softened butter and sugar in small bowl with electric mixer until light and fluffy. Beat in eggs, one at a time. Transfer to medium bowl; stir in sifted flour and custard powder.
4.Spread half the mixture into pan; spread over custard. Dollop small spoonfuls of remaining cake mixture over custard; carefully spread with spatula to completely cover custard. Top cake mixture with rhubarb; brush gently with melted butter then sprinkle with extra sugar.
5.Bake cake about 1¼ hours; cool in pan.