Preheat your oven to 155°C (310°F) / 135°C Fan / Gas Mark 2. Generously butter a 23cm / 9-inch springform cake tin and line the base with baking parchment.
In a large mixing bowl, cream the softened butter and golden caster sugar together until light and fluffy. You can use an electric whisk or a stand mixer with the beater attachment for this.
Gradually beat in the egg yolks one at a time until fully incorporated.
Add the self-raising flour and salt, mixing on a low speed just until the dough comes together. Be careful not to overmix.
Press the dough evenly into the prepared tin using the back of a spoon.
Bake for 55–60 minutes, or until the top is a beautiful golden brown.
Let the cake cool in the tin for 10 minutes before carefully releasing the springform catch.
Transfer to a wire rack to cool completely. The middle will sink slightly – this is perfect for holding fillings!
Dust with icing sugar just before serving, or fill the sunken centre with cream and fruit.
Don't overmix the flour.
Mix just until the dough is combined to ensure a tender, crumbly texture.