Don’t let the sight of green goo oozing out of your pastry make you lose your appetite- it’s just pandan cream. A tropical plant with long green leaves, pandan is used in Southeast Asia to flavor many different foods and drinks. Called ‘Thai vanilla’, it has a sweetness that lends itself particularly well to making desserts. One of the most popular uses in Bangkok is to make it into a rich green pandan custard, which can be eaten inside rolls (like in the above photo), or slathered over toasted white bread.