For the poached raisins, bring the simple syrup and rum to a boil. Add the raisins and golden raisins, remove from the heat, and cover. Let sit at room temperature overnight, then reserve in the refrigerator.
Roll out dough into a rectangle 13 in/33 cm wide and ¼ in/0.6 cm thick. Let the dough relax in the refrigerator for 30 minutes, covered in plastic wrap, u