Ingredients
Kumara cake
Orange frosting
Method
Kumara cake
1.Preheat oven to 180°C/160°C fan forced. Grease and line base and side of a 20cm (base diameter) round spring-form cake pan with removable base with baking paper. Combine flour, baking powder, bicarbonate of soda, cinnamon, sugar, sultanas, walnuts and kumara in a bowl. Whisk eggs, oil, zest and juice together. Pour into kumara mixture; stir until combined.
2.Spoon mixture into prepared pan; level surface. Bake for 45 minutes. Turn down oven to 160°C/140°C fan forced; bake for 30 minutes or until golden and cooked when a skewer inserted at centre comes out clean. Cool in pan for 5 minutes. Transfer to a wire rack to cool completely.
3.Make orange frosting as per method below.
4.Cut cooled cake in half horizontally. Transfer cake base to a serving plate; spread base with half the frosting. Replace top of cake; spread with remaining frosting. Serve.
Orange frosting
5.Using an electric mixer, beat butter in a bowl until pale. Beat in cream cheese, zest and sifted icing sugar until combined and smooth.