Orange chiffon cake

Orange chiffon cake with orange swirl
Adapted from https://jeannietay.wordpress.com/2015/06/04/orange-chiffon-cake-joy-of-bakings-recipe/

Ingredients:-
6 large eggs yolk
225g flour
170g caster sugar
1 tbsp baking powder
1/2 tsp salt
orange zest from 3 small oranges
120g vegetable oil
180 g fresh orange juice
1 tsp pure vanilla extract

7 large eggs white
50g caster sugar
1/2 teaspoon cream of tartar

Instructions:

1. Zest the oranges and squeeze out juice. Measure out 180g and set aside.

2. Sift together the flour, baking powder. Set aside.

3. In a large mixing bowl, place the yolks, oil, salt, vanilla extract and 180g sugar and beat with a hand whisk until combined and sugar has dissolved.

4. Beat the egg whites until frothy before adding cream of tartar. Continue beating until fine foams then gradually add in the 50g of sugar. Beat to near stiff peaks

5. When the meringue is almost done, add in the orange juice to the yolk batter followed by the flour and whisk quickly to incorporate until mixed.

6. Add 1/3 of meringue into the yolk batter and mix well with a hand whisk to lighten the batter. Add another 1/3 and mix till combined. Lastly add the final portion and whisk briefly to combine before switching to spatula to scoop batter from bottom and fold up until no more streaks of yolk batter can be seen.

7. Scoop some batter into another clean bowl and mix some orange colouring and gently mix .

8. Pour alternately with both batter into prepared pan and use a tooth pick or the cake tester to make swirl and tap on the table top to remove bubbles and also to even out the batter.

8. Bake in preheated oven at 160C for 80 minutes or until cooked. Invert immediately to cool completely before unmoulding.