Ingredients

  • for the cake
  • 3 1/2 cups cake flour
  • 3 teaspoons baking powder
  • 2 teaspoons baking soda
  • 3 teaspoons ground cinnamon
  • 3 1/2 cups loosely packed brown sugar
  • 1 1/2 cups sultanas
  • 1 1/2 cups walnuts
  • 5 cups grated golden kumara, about 2 large
  • 5 eggs
  • 1 1/2 cups vegetable oil
  • 2 tablespoons fresh orange juice
  • grated rind of 3 oranges
  • for the frosting
  • 14 ounces (400g) cream cheese, not softened
  • 3.5 ounces (100g) butter, softened to room temperature
  • grated rind of 2 oranges
  • 4 cups approximately, icing (powdered) sugar

Method

  • Preheat oven to 350F (180C). Spray a deep 12-inch (28 to 38cm) spring-form cake tin with non-stick baking spray and line the base with parchment paper.
  • Whisk the dry ingredients together in a large mixing bowl. Stir in the grated kumara.
  • In a separate medium mixing bowl, beat the eggs, oil, orange juice and rind together.
  • Mix the wet ingredients into the dry ingredients until well combined.
  • Pour cake batter into the prepared tin and bake for 25 minutes, then reduce the oven temperature to 320F (160C) and bake for a further 30 to 35 minutes, until the cake begins to pull away from the tin and is cooked in the centre when tested with a cake tester. Turn out and cool on a wire rack completely, until cold.
  • Meanwhile, prepare the frosting: In a large mixing bowl, mix all the ingredients together until whipped smooth and of a good spreading consistency.
  • Frost the top of the cake. Chopped nuts can be sprinkled over if desired.