2. Beat the butter and the sugar together until pale.
Step 4:
Step 5:
3. Stir in the flour to get a smooth paste. Turn on to a work surface and gently roll out until the paste is 1cm/½in thick.
Step 6:
Step 7:
4. Cut into rounds or fingers and sprinkle with a little extra caster sugar. Put on a baking sheet and chill for 20 minutes. Bake in the oven for 15-20 minutes until pale golden.