Ginger
Ginger is really a superherb.
It is cultivated and used in tropical Asia for more than 3000 years.
Among lots of other qualities it is a booster for your immune system, it will warm you up in cold days or cool you off on those hot summer days and it is used for its anti-inflammatory properties. And it tastes great!
You can use ginger in your soups, curries, asian wok recipes, eat it sweet or pickled and drink ginger tea or ginger beer.