Step 1

Preheat the oven to 180C/160C Fan/Gas Grease and line two 20cm/8in sandwich tins. Use a piece of baking paper to rub a little butter around the inside of the tins until the sides and base are lightly coated, then line the bottom with a circle of baking paper.

Step 2

Break the eggs into a large mixing bowl, then add the sugar, flour, baking powder and butter. Mix together until well combined with an electric hand mixer (you can also use a wooden spoon), but be careful not to over mix. Put a damp cloth under your bowl when you’re mixing to stop it moving around. The finished mixture should fall off a spoon easily.

Step 3

Divide the mixture evenly between the tins: this doesn’t need to be exact, but you can weigh the filled tins if you want to check. Use a spatula to remove all of the mixture from the bowl and gently smooth the surface of the cakes.

Step 4

Bake the cakes on the middle shelf of the oven for 25 minutes. Check them after 20 minutes. The cakes are done when they’re golden-brown and coming away from the edge of the tins. Press them gently to check – they should be springy to the touch. Set aside to cool in their tins for 5 minutes. Run a palette or rounded butter knife around the inside edge of the tins and carefully turn the cakes out onto a cooling rack.

Step 5

To assemble the cake, place one cake upside down onto a plate and spread it with plenty of jam. If you want to, you can spread over whipped cream too. Top with the second cake, top-side up. Sprinkle over the caster sugar.