Black and White Star Cookies
Combine the sugar, flour, chopped butter, vanilla sugar, egg and lemon zest and quickly chop with a knife until crumbly.
Quickly knead with your hands until smooth, cover with plastic wrap and chill for about 30 minutes in the refrigerator.
On a lightly floured work surface, roll out the dough until 3-4 mm thick (approximately 1/8 inch).
Cut out star shapes with a cookie cutter, place on a baking sheet and bake in a preheated oven at 180°C (approximately 350°F) for 10-12 minutes.
Transfer the hot cookies to a wire rack to cool.
Chop the chocolate, melt over a hot water bath, let cool slightly then dip 1/2 of the cookies in the chocolate to coat. Let dry on a wire rack.
Mix 2 teaspoons water with enough powdered sugar to form a paste and use to glue 1 plain cookie and 1 chocolate cookie together. Let dry.
Dust with powdered sugar to serve.