Before unmoulding, run the base of the moulds under warm water. The Popsicles need to be hard when dipped in the chocolate sauce. If they are too soft, place them in the freezer on parchment paper for 15 minutes before dipping them in the chocolate. One at a time, dip them halfway into the sauce, letting the sauce drip down the sides once they are right side up. The Popsicle is easier to dip when the chocolate is transferred to a tall, narrow container, like a drinking glass.