Mastic is a gum and an aromatic resin that is cultivated from the bark of the mastic tree: An evergreen tree growing in the Mediterranean. It’s been used for centuries as a natural gum, hence where the word mastication was derived. It is crushed and used in powder form in many desserts in part of the Mediterranean and across the Middle East. Use mastic tears sparingly as the flavour the gum imparts can become overpowering. Note- mastic tears come in two different sizes.