Place the marshmallow and the strawberry on a roasting stick and roast over smoldering coals until a toasty brown hue appears on the marshmallow, turning every minute. Remove from heat and place the marshmallow on top of a chocolate wafer cookie and dark chocolate. Cut the strawberry in half and place the halves on top of the marshmallow. Drizzle the balsamic reduction over the strawberries. Top with the chocolate wafer cookie and serve immediately.