Pandan Chiffon Cake is very popular in Malaysia and Singapore and the surrounding countries. It is made with the pandan plant, or pandanus, or screw pine. The leaves has a sweet flavour and it extensively used in cakes and savouries. The juice is also used as a green colouring. You can find pandan leaves in Asian supermarkets and it can be costly. I use pandan essence instead. This can be found in Asian supermarkets as well.