“If you like to use butter, it must be really soft,” Mary advised.
Next, bakers should add the self-raising flour, baking powder and milk to the bowl.
Mary then grated the zest of two lemons before adding to the rest of the mixture.
Bakers should beat the ingredients in the bowl together until “beautifully smooth”.
Once the mixture is ready, grease a traybake tin, measuring 23cm by 30cm, and line it with non-stick paper.