Beat the eggs and sugar together until they are pale and thick enough to leave a trail when you lift out the whisk – they should have trebled in volume. This will take about 10 minutes, so use a counter-top electric mixer if you have one. Fold the dry ingredients into the egg mix using a large metal spoon, being careful not to knock out too much air. Spoon carefully into the tin and spread out to the corners. Bake for 12 minutes or until the cake feels firm to the touch. Flip out onto a sheet of baking parchment scattered with caster sugar.