Make the cake base: Preheat your oven temperature to 350 degrees F. Gathering all the ingredients before making your cake. Prepare your cake pan by greasing it or lining the bottom with parchment paper.
Separate egg yolks and egg whites into two different mixing bowls. Start working on the egg white bowl first: Beat egg whites with an electric mixer until stiff peaks form (this should take about 5 minutes). Once stiff enough, gradually add one cup of powdered sugar, 1/5 cup at a time, while beating continuously at high speed until the mixture thickens. Set aside.
In the egg yolk mixture bowl, pour oil and milk. Then, sift the cake flour, cornstarch, and baking powder into the batter. Beat until smooth.
Now, slowly fold the beaten egg whites into the egg yolk bowl. Mix it with a spatula. (about 30-40 strokes/fold). Do not use a mixer or overmix!
Pour the cake batter into the cake pan. Drop the cake pan on the kitchen counter a few times until you no longer see bubbles. Doing this gives you a smooth surface for the cake base,
Put the cake pan into the oven and bake it for 30 minutes at 350 degrees F. Light golden brown should be the final cake color. A toothpick put in the center should come out clean when you test it. When the cake's edge starts to gently come away from the pan, it means it's done. :)
Make the heavy whipping cream frosting: In a large mixing bowl, beat whip heavy whipping cream and sugar with an electric mixer until stiff peaks form.
Prepare simple syrup: In a small saucepan, combine the water and granulated sugar. Heat the mixture over medium-low heat, stirring occasionally, until the sugar has completely dissolved. Once the sugar has dissolved, bring the mixture to a gentle boil, then reduce the heat to low and let it simmer for 1-2 minutes. Once cooled, the simple syrup is ready to brush onto the fruit for your cake. You can use honey for a quick fix.
Assemble the cake: Once the chiffon cake has cooled, slice it horizontally into three layers. Brush each layer with the prepared simple syrup. Spread a layer of whipped cream frosting on top of each layer. Cover the entire cake with the remaining whipped cream frosting. Garnish with fresh fruits, and brush a thin layer of simple syrup on the fresh fruit for a glossy appearance. (optional) Slice and serve. Enjoy your fresh Asian fruit cake!