3/4 cup butter,softened,plus extra for greasing
6 tbsp confectioners sugar
1 tsp vanilla extract or grated rind of 1/2 Orange
2 1/2 cups all purpose flour
1 oz/25 g semisweet chocolate,melted
1 egg white,beaten
1:Preheat the oven to 350 F/180 C.Lightly grease a cookie sheet.Beat the butter and confectioners' sugar in a mixing bowl until light and fluffy.Beat in the vanilla extract or granted orange rind.
2;Gradually beat in the flour to form a soft dough.Use your fingers to incorporate the last of the flour and bring the dough together.
3;Divide the dough in half and beat the melted chocolate into half.Keeping each half of the dough separate,cover and let chill for about 30 minutes.
4;Roll out each piece of dough to a rectangle measuring 3x8 inches/7.5 x20 cm,and 1 1/2 inches/4 cm thick.Brush one piece of dough with a little egg white and place the other on top.
5;Cut the block of dough in half lengthwise and turn over one half.Brush the side of one strip with egg white and butt the other up to it,so that it resembles a checkerboard.
6;Cut the block into thin slices and place each slice flat on the cookie sheet,allowing enough room for them to spread a little during cooking.
7;Bake in preheat oven for about 10 minutes,until just firm.Let cool on the cookie sheets for few minutes,before carefully transferring to a wire rack with a spatula.Let cool completely.
I didn't measure the lenghtwise dough when roll out instead I place the dough in square cookies pan before chill in fridge.With 2 same size square pan,I don't have to worried about off measurement or wasting extra dough.Give at try,it's really easy and simple.