Genoise Sponge Method • For the sponge cake, preheat the oven to 180C/350F/Gas 4. Grease a 20cm cake tin and line the base and sides with greaseproof paper, making sure the paper extends above the top of the tin. • Place the flour and cocoa powder in a bowl and mix thoroughly • Place the eggs, egg yolk and sugar in a bowl set over a pan of barely simmering water, making sure the bottom of the bowl does not touch the water. Whisk the eggs and sugar over the heat for about five minutes or until the mixture is light, fluffy and warm. • Remove the bowl from the heat and whisk with an electric whisk for about five minutes or until the mixture has tripled in volume and has the consistency of softly whipped cream. • Sift one-third of the flour and cocoa powder mixture over the whipped eggs and gently fold in using a large rubber spatula. Fold in half of the remaining flour mixture, then the rest. (Do not over mix the batter.) • Mix a cupful of the batter into the melted butter with a small spatula. When completely combined, fold the butter mixture into the batter with a spatula. Divide the batter between the prepared cake tins, smoothing the top level. (The batter should not reach more than half the depth of the tins.) • Bake the cakes in the oven for 20-25 minutes or until the mixture shrinks slightly from the edges of the pan and the top springs back when lightly pressed. Cool on a wire rack, removing the cake tins and greaseproof paper as soon as they are cool enough to handle.