Preheat the oven to 170ºC (fan). Grease and line the base of the Tala Performance Baking tray 34.5 x 24.4 x 2cm.
Whisk the egg yolks, half the caster sugar (75 grams) and the vanilla extract for 3-4 minutes until thick and foamy. Sift in the flour and fold together until the mixture is smooth and thick.
In a separate bowl, whisk the egg whites on a medium speed for 3-4 minutes until they reach soft peaks. Turn the speed up and slowly pour in the remaining caster sugar (75 grams). Keep whisking for another 2-3 minutes until the meringue is glossy and reaches stiff peaks.
Spoon half the meringue into the egg mixture and gently fold to combine. Now fold in the rest of the meringue. Be careful not to overmix as you want to keep as much air in the cake mixture as possible.
Spread the cake mixture into the baking tray and bake for 14 minutes, until the sponge is lightly golden, risen and springs back when pressed. Whilst the cake is in the oven, lay a large piece of baking paper (bigger than the baking tray) on a work surface and generously dust with icing sugar.
As soon as the cake is out of the oven, run a knife around the edges to peel the cake away from the sides. Flip the baking tray upside down on top of the baking paper. The cake should fall out easily. Carefully peel off the baking paper on top of the cake.
Starting from the short edge, roll the sponge up (with the baking paper inside) and leave to cool completely in the roll shape for at least 1 hour.