To assemble, line an 8 x 4-inch loaf pan with plastic wrap or parchment paper that goes up and over the sides to create a sling. Set aside.
Coat the bottom of the prepared pan with about a 1/4-inch-thick layer of the cream. Top the layer of cream with the cookies. Spread another 1/4-inch layer of cream and then top with more cookies. Repeat until you have used all of the cream and filled the pan. There may be cookies or cream leftover, depending on the shape of pan and how large the cookies are.
Finish with a layer of cookies over the cream horizontally. Add two more layers of cream and cookies, ending with a layer of cream. Cover with plastic wrap and refrigerate the cake for at least 6 hours, but ideally overnight.
Once the Ice Box cake is ready to decorate, prepare the Brown Sugar Balsamic Swiss Meringue below.
Cover the icebox cake in a ¼-inch thick layer of the meringue. Smooth the meringue using a metal spatula. Refrigerate for about 15 minutes.
Place the remaining meringue into a pastry bag fitted with a large Star Tip (Ateco #825). Pipe swirly designs over the smooth meringue.
Refrigerate for at least an hour (can be finished to this point the day before). Pro Tip: Do not cover it or you’ll ruin the design.
Just before serving use a blow torch to toast the meringue.
Use a thin, sharp knife, dipped in hot water to slice. Dip in the hot water between each slice.