Put the butter in a bowl and beat with a wooden spoon until soft. Beat in the sugar, then stir in the lemon zest and ginger
Stir in the flour and work with your hands to form a soft dough.
Heat oven to 150ºC/130ºC fan/gas 2
Either use cake tin. Grease a 22cm loose-bottomed tin with fluted edges. Tip into the tin and press into an even, flat layer with your fingers. Prick all over surface with a fork.or roll out to about 1 cm thick and use biscuit cutters for the shapes you want. Bake in the oven for 40 mins until pale gold.
If using a cake tin, then cut into wedges while still in the tin then leave to cool before removing from the tin. Sprinkle with caster sugar to serve.