- STEP 1
Preheat the oven to 170°C. Separate the egg yolks and egg whites into two large mixing bowls.
- STEP 2
Whisk the egg yolks along with 20g sugar, flour, oil, milk, baking powder, and vanilla extract and set aside. Do not over-whisk.
- STEP 3
Using an electric whisk or stand mixer, whisk the egg whites until foamy, then whisk in the sugar in 3 small increments (20g at a time) and add the cream of tartar.
- STEP 4
Continue to whisk for about 10-15 mins until the mixture is light and airy. You can check if it is ready by turning the bowl upside down - if the mixture does not drip and stays in place then it is ready.
- STEP 5
Slowly fold the egg white mixture into the batter in small increments (about 3 times), and continue to cut and fold the mixture until it is fully combined. Do not over-mix.
- STEP 6
Grease the bottom of an 8-inch tube pan and pour the mixture in. Gently tap on the table a few times to ensure that it is evenly spread. Bake in the oven for about 40-50 mins, or until a toothpick inserted into the centre comes out clean.
- STEP 7
If you are using an angel-food cake pan, place the pan upside-down on a wire rack. If you are using a chiffon cake pan, place the pan upside-down on a tall heavy bottle. Cooling the cake upside-down will help it stretch downwards instead of collapsing.
- STEP 8
Allow it to cool fully before removing it from the pan. To release the cake from the pan, gently use a knife to remove the cake from the sides.