As you can see above, I have lined my tin with parchment paper and have also thoroughly greased it. This is extremely important because the marshmallow mix is super sticky. It remains sticky even after you rest it for a minimum of 8 hours. So if you do not line your mold well, you will end up with your marshmallow sticking miserably to it. The parchment lining helps to ease lifting the marshmallow out of the tin. The greasing helps release it from the parchment paper.