• Preheat the oven to 180`c
• Sift the flour into a mixing bowl and rub in the butter until the mixture resembles breadcrumbs
• Stir in the sugar and lemon rind
• Mix to form a dough with the egg
• Turn onto a floured work surface and knead until smooth
• Roll the dough out into a rectangle about 1/4 inch thick
• Cut into bars about 7x3cm, then transfer to a greased baking tray
• Mark each bar in half with a knife and arrange the chocolate drops on each side to resemble domino dots
• Bake for 12-15 minutes
• Leave to cool for 5 minutes in the tray before transferring to a cooling rack to cool completely.

For the big kids amongst us and the little ones!