Using a hand whisk, whisk egg yolks and oil in a large mixing bowl until mixture is combined and turns slightly pale. Then, whisk in milk and vanilla until combined. Sift in flour and salt and whisk gently until the batter is smooth and combined.
For the egg white mixture:
Using an electric mixer with a whisk attachment, beat egg whites in the lowest speed for at least 10 mins to stabilise the mixture. Increase beating speed to the next higher speed. While beating, add sugar gradually. Increase beating speed to another higher speed and continue to beat until stiff peaks form. The meringue should be very smooth with tiny bubbles. Do not over-beat the mixture.
Using a hand whisk or a spatula, gently fold in the egg whites to the egg yolks mixture in 3-4 batches. It is ok to mix the 1st batch of egg white more vigorously into the egg yolk mixture but the subsequent portions must be folded in very gently. Make sure that most of the white is not visible after folding.
Pour batter into an un-greased 20 cm chiffon tube pan. Give the pan a gentle tap and use a skewer to draw a zigzag on the batter surface to remove any large air bubbles. Bake at 160°C for 55 mins or until it is thoroughly baked. IMPORTANT: This cake has to be baked for at least 50 mins in total.
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