Place the eggs and vanilla extract into a bowl. Gradually add in sugar and whisk until pale and thickened. Sift the flour into the bowl and fold together. Pour the sponge mixture into a baking tray with baking paper and bake for 10 minutes at 200'C preheated oven. Place the cooked sponge on a wire rack and place the sponge together with the wire rack into a plastic bag for cooling down.
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