4 egg yolks
6 tbsps fine granulated sugar
1/3 cup vegetable oil
1/2 cup orange juice
1/2 tsp orange paste
Zest from 1 large orange
3/4 cups cake flour
2/3 cups all-purpose flour
1 tsp baking powder
1/2 tsp salt
5 egg whites
1/8 tsp Cream of tarter
9 tbsps fine granulated nsugar
Measure all ingredients A,B and C
Pass ingredient B through a fine sieve for 3 times, to aerate.
Beat egg yolks with half the sugar in ingredient A until light, then add in the remaining half of the sugar and the vegetable oil. When mixture is well mixed, add orange juice, zest and orange paste. Beat well, then add in ingredient B.
Whisk egg whites in a clean dry bowl in medium speed, add in cream of tartar and continue to whisk until soft peak before adding in the sugar slowly 1 tbsp at a time. Whisk until glossy stiff peaks - not too stiff otherwise too dry.
Add 1/3 of the whisked egg whites to the egg batter and stir in until egg batter is loosened and tempered. Then add in all the egg whites, this time fold in gently with a large spatula, using the cut and fold method (cut down the spatula at 6 o'clock, then scraping the bottom of the bowl and fold the mixture to the top, turning bowl as you fold). Repeat this folding gently.
Bang bowl onto counter to remove bubbles.
Pour batter into UNGREASED 20 cm/8 inches tube pan with the bowl as near to tube pan as possible. Level the batter in tube pan by turning the tube pan in a jiggling movement. Using a chopstick or a thin spatula, run through the batter to remove big bubbles. Bang on counter again to remove more buddles.
Put in the lower 1/3 rack of the oven and reduce 350f, bake for 10 minutes.
Reduce 325f and bake further 40 minutes until a prick test comes out clean, then cake is cooked through.
Remove from oven and invert tube pan either with tube on a bottle, steel funnel. (inverting tube pan using the 3 legs of the tube pan is not as good, as it is too low and the heat from the cake hits back and moisten the surface of the cake)
Wait until cake is cooled before using a flat narrow knife, scrape the tube from top to bottom to dislodge the cake. Scrape the sides of cake, positioning the knife as close to the side of tube pan as possibly. Push cake up from the loosen base of tube pan. Then, scrape the bottom of the base of tube pan to dislodge cake.
Slice cake using a serrated knife in a sawing motion so that slices will be nice and neat. Do not press on cake.