325g plain flour
200g butter, chilled and chopped
125g golden caster sugar
1 lemon, zested and juiced
2 egg yolks
200g icing sugar
Heat the oven to 180C/160C fan/gas 4. Whizz the flour and butter to breadcrumbs in a food processor, add the sugar, lemon zest and egg yolks and process to a dough. Roll out the dough to 5mm thick and cut out biscuits. Put on a buttered baking sheet and cook for 10-15 minutes. Cool.
Sift the icing sugar into a bowl and mix with enough lemon juice to make a runny icing. Drizzle the lemon icing over the biscuits.