Genoese Sponge

• 4 eggs
• 4 ounces castor sugar
• ½ teaspoon vanilla ess

Combine eggs, sugar and vanilla or grated lemon rind, and whisk mixture in the top of a double boiler until it is very light and thick and lukewarm. Transfer mixture to electric mixer and beat at high speed for 3 to 5 minutes, or until mixture holds shape.

Sift flour and cornflour and fold carefully into the mixture a little at a time until thoroughly blended. Melt butter in the top of