STEP 1.
Sift the flour and spices into a bowl. In a separate bowl, beat butter and sugar with electric beaters until thick and pale, then add eggs, 1 at a time, beating well after each addition. Fold ii the flour mixture slowly, then stir in currants and lemon zest. Wrap in plastic and chill for at least 2 hours.
STEP 2.
Line 2 baking trays with baking paper. Preheat the oven to 180°C. Roll out dough 4-5mm thick then cut with a round biscuit cutter and place on the trays. Repeat with remaining dough, re-rolling the trimmings.
STEP 3.
Sprinkle biscuits with extra sugar. Bake for 10 minutes until firm to touch but still pale. Cool on trays for 5 minutes, then transfer to a rack to cool completely.
