this is how I'd make it, adding an extra 1/2 teaspoon of baking powder as well as what's in the recipe
Ingredients:
6 oz (175g) Self-raising flour
1 rounded teaspoon of baking powder
3 large eggs
6 oz (175g) Caster sugar
6 oz (175g) Butter
0.5 tsp Vanilla extract
3 tbsp Fruit jam (filling)
150ml Double cream, whipped (filling)
Dusting of icing sugar
Pre-heat oven � gas mark 3, 325�F (170�C)
grease and line with a circle of greaseproof paper, two 8 inch diameter sponge tins, 1� inches deep.
Seive flour and the baking powder into a large mixing bowl, hold the sieve quite high to give the flour air as it goes down.
Break eggs into the flour, add caster sugar and the butter � the butter has to be soft, room temperature. Finally, add the vanilla extract.
With an electric hand whisk, whisk everything together until you have a smooth, well-combined mixture. This will take about one minute � if you don't have an electric whisk, you can use a wooden spoon
The mixture should drop easily off the spoon when you give it a tap on the edge of the bowl. If it seems too stiff, add 1-2 teaspoons of water and mix again.
Divide the sponge mixture equally between the prepared tins and smooth out the surface with a palette knife.
Place the two tins on the centre shelf the oven and bake for 30-35 minutes. Don't open the oven door until 30 minutes have passed or the sponges will sink. To test if the sponges are ready, touch the centre lightly with your finger if it leaves no impression and springs back, the sponges are ready.
Remove the sponges from the oven then wait for about 5 minutes before turning them out on to a cooling rack and carefully peeling off the greaseproof paper.
Leave sponges to go cold before you add fillings and toppings. Traditionally Victoria