Fennel seeds are the dried ripe fruit of the perennial herb. They resemble cumin seeds but are green and plumper with yellow ridges. Good quality fennel seeds have a warm, aniseed flavour and aroma, which turns slightly bitter when roasted. Fennel seeds are used in many Indian spice mixtures to enhance meat dishes and sweeten desserts. It is also one of the ingredients used in tea spice or chai masala.