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Take one parchment paper and place the dough cylinder on the rectangle drawn and turn the dough it into rectangle by pressing from the upper side.
Cover the Rectangular dough with the side of the parchment paper and using a rolling pin flatten it properly.
Refrigerate the Rectangular dough for around 2 hours.
Following the process mentioned prepare a 5×15 inch rectangle of another portion of the dough and refrigerate it for 2 hours as well.
Take one portion dough out of the refrigerator and unwrap it.
Now trim all the sides of the rectangle by around ¼ inch to make the rectangle perfect.
Using a scale and knife cut the dough into 9 strips lengthwise (one strip should be of around ½ inch thick).
Following the same process cut another portion into 9 lengthwise strips as well.
There should be 9 white and 9 Chocolate strips in total.
Now it’s time to prepare the Checkerboard finally!
Take the Egg white and slightly beat it to prepare an Egg wash.
Take a piece of Plastic Wrap place it in the top of a table or Kitchen base.
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Take one Chocolate strip and place it carefully on the middle of the Plastic wrap.
Brush both the open side of the chocolate strip with egg wash and then place one vanilla strip on each side of the chocolate strip and join both the side very carefully.
Now brush the top of three strips with egg white and place a vanilla strip just upon the chocolate strip and then brush with the egg white just like the lower layer and place one Chocolate Strip on each side of the Vanilla Strip.
Place final layer of the Cookie dough in an alternate manner and complete making the checkerboard structure.
Don't brush egg white in the outer wall of the log.
Now Wrap the Log with the Plastic Wrap and gently press to fill any gap inside.
Refrigerate the Log for around one hour.
I have prepared two 15 inch long log.