Add the flour mixture all at once and mix on low speed until the dough just comes together but still looks shaggy, approxi- mately 30 seconds. Do not overmix. Remove the bowl from the stand mixer. With a plastic bench scraper, bring the dough completely together by hand.

Stretch two sheets of plastic wrap on a work surface. Divide the dough in half and place each half on a piece of the plastic wrap. Pat each half into a rectangle, wrap tightly, and refrigerate until chilled throughout, at least 2 hours or preferably overnight.

Let the dough halves sit at room tempera- ture until the dough has warmed up some but is still cool to the touch, 15 to 20 minutes.

Put a sheet of parchment paper the same dimensions as a half sheet (13 by 18-inch) pan on the work surface and dust lightly with flour. Put one dough half on top.

Using a rolling pin, roll the dough half into a rectangle approximately 11 by 13 inches and 1⁄4 inch thick or slightly under. If the edges become uneven, push a bench scraper against the dough to straighten out the sides. To keep the dough from sticking to the parchment paper, dust the top with flour, cover with another piece of parchment paper, and, sandwiching the dough between both sheets of parch- ment paper, flip the dough and paper over. Peel off the top layer of parchment paper and continue to roll. Any time the dough starts to stick, repeat the sand- wiching and flipping step with the parchment paper.

Ease the dough and parchment paper onto a half sheet pan. Repeat with the remaining dough half and stack it on top. Cover with a piece of parchment paper and refrigerate the layers until firm, at least 30 minutes.

Heat the oven to 350°F. Line a couple of half sheet pans with parchment paper.
Let the dough sit at room temperature for up to 10 minutes. Invert the dough onto a work surface and peel off the top sheet of parchment paper. Roll a dough docker over the dough or pierce it numerous times with a fork. Using a 1 3⁄4 by 2 1⁄2-inch rectangular cutter, punch out the cookies. Reroll the dough trimmings, chill, and cut out more cookies.

Put the shortbread on the prepared sheet pans, evenly spacing up to 16 cookies per pan.

Bake one pan at a time for 10 minutes. Rotate the pan and bake until the cookies feel firm and hold their shape when touched, 3 to 5 minutes more. Let the cookies cool completely on the sheet pans. Repeat with the remaining pan.

Step #2: Frost the Cookies
Blend the halvah in a food processor until fairly smooth. Drizzle in the white chocolate and blend until incorporated. The halvah will turn into a thick paste.

In the bowl of a stand mixer fitted with the paddle attachment, mix the butter briefly on medium speed for
5 to 10 seconds. Add the sugar and beat until the butter mixture is aerated and pale in color, 3 to 4 minutes. Scrape the sides and bottom of the bowl with a rubber spatula to bring the frosting together. Briefly mix in the vanilla and salts until incorporated, approximately 1 minute. Add the halvah paste and mix until smooth, with a little texture left from the halvah.

Fit a pastry bag with the Ateco tip #32 and fill with the frosting.
Make pairs of similar-size cookies. Turn half of the cookies over. Leaving an 1⁄8-inch border, pipe rows of dots onto the cookies. The frosting should be approximately as thick as the cookie. Top each frosted cookie with a second cookie and press lightly to adhere.

Step #3: Finish the Cookies
Freeze the piece of halvah until chilled, 30 minutes.

Line two half sheet pans with parchment paper. Dip a quarter of the long side of each sandwich cookie into the milk chocolate, shake off the excess, and place on the prepared pans. Using a vegetable peeler, shave
a piece or two of halvah and place onto the chocolate- dipped part of each cookie. Refrigerate until the chocolate is firm, approximately 1 hour.

The cookies can be refrigerated in an airtight container for up to 1 week. 

Enjoy! 

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