Store your leftover marzipan for making delicious tarts or galettes, making a mince pie filling even more delicious, or taking your next crisp or crumble recipe to AMAZING! Be sure to securely wrap your leftover marzipan trimmings from covering the Christmas Cake in plastic cling film. Then store in an airtight container or plastic storage bag kept in a cool, dry, dark place. The marzipan will last for up to 3 weeks when stored properly.