Preheat the oven to 180C/160C Fan/GM4 and grease your baking trays or line with baking parchment

Beat the butter and sugar together, then add the egg yolk, lemon juice and zest and mix well

Sift the flour and spices together and combine with the butter mixture

Stir in the currants

Gather the dough into a ball, turn out onto a floured surface and roll to about 1/2 cm thick

Cut out rounds with a cookie cutter and transfer to your baking sheets

Bake for 10-12 minutes then remove from the oven

Very lightly brush each biscuit with beaten egg white then sprinkle with sugar. For best results, do one biscuit at a time

Return to the oven for a further 4-5 minutes until golden brown

Cool on the baking tray for 5-10 minutes then transfer to a wire rack to cool completely