in a large bowl mix the flour butter and sugar untill the mixture has a bread crumb like texture. add the egg and the coffee mix again to make a firm dough.

preheat the oven to 190°F C gas 5. take teaspoons of the mixture and roll into small balls with your hands. place the balls on a baking sheet leaving space between each one as they will spread and bake for 15mins. remove and place on a wire rack to cool.

mean while make the butter icing. put the soft butter in a bowl and beat in enough icing sugar to make a thick butter cream cream icing icing. add the vanilla essence. when the cookies are cold spread half of them with the butter cream and top with the rest to make a sandwiches. dust with the icing sugar if you want.