In a mixing bowl, beat the softened butter and caster sugar together until pale and creamy.

Mix in the self-raising flour, then use your hands to bring everything together into a soft dough.

Lightly dust your work surface with caster sugar. Roll the dough slightly, then shape it into balls about the size of a walnut.

Place the dough balls on a baking tray. Dip a fork into a little oil, then gently press each biscuit to flatten slightly and create a smooth top.

Let the biscuits cool on the tray for a few minutes before moving them to a wire rack.