Roll out the red and pink doughs to about ¼ of an inch thick. You will need two small Heart-shaped cookie cutters. One should be bigger than the other.
Using the larger cookie cutter, begin cutting heart shapes out of the pink dough. You will need enough to form a 13in log when placed together.
Take one of your pink hearts and rub some egg whites on the back of it. Press another pink heart to it until they are stuck together. Repeat this until you have a 13in log of dough hearts.
Using the smaller cookie cutter, cut enough hearts shapes out of the red cookie dough. You need enough hearts to form a 13 inch log.
Take one of your red hearts, rub with some egg whites on the back of it. Press another red heart to it until they are stuck together. Repeat this until you have a 13in log of dough hearts. Refrigerate about 10mins if dough is getting too soft.
Grab the pale dough from the refrigerator and cut a small amount off. Place the small amount of dough between some parchment paper and roll it out about ⅛ of an inch thick.
Place the pink hearts log on the dough. Rub the sides of the pink heart log with eggs whites. Using the parchment, begin working the pale dough about the pink heart log, making sure to have good cohesion to prevent holes in the finish cookies. Repeat this for the red heart log. Refrigerate if needed.
Using more of the egg whites, glue together the pink and red heart logs, making sure both hearts are facing up. Cut a bit more of the pale dough. Work it in your hands to warm it up. Fill in gaps and seams between the two heart logs using soft pale dough. Refrigerate as needed.
Cut the rest of the pale dough in two. Work it in your hands to warm it up, then form two rough logs about the same length of the heart logs. Place pale dough logs on the opposite sides of the heart logs. Begin shaping and molding softer pale dough until the entire log of dough is an even cylinder shape. Wrap in plastic wrap and chill until firm.