Fennel seeds are 4-8 cm long, thin & slightly curved with colors that vary from brown to light green. It has bittersweet smell & the slightly minty taste. This fragrant spice is used to flavor pickles, chutneys & curries. It is a very efficient digestive & mouth freshener & is often eaten chewed after meals. Fennel contains many minerals & vitamins, fibers, potassium, magnesium, calcium, iron, etc. It is beneficial for the immune system of the body. The vitamin C from the bulb of the plant is antibacterial & very useful to the immune system.