It's called Zebapique and it is a bush found mainly in the Caribbean but can be purchased as a herbal tea online. Being from the Caribbean, I have had experiences drinking this tea as a child and it really does work.
It helps to reduce fever and the symptoms of the cold and flu. However, it is speculated that this plant is also good for treating fungal infections and controlling diabetes.
For this to work the dried leaves (or the tea) has to be brewed and and consumed at a lukewarm temperature without additives (Yes that means no sugar!). Then you have to ignore its extremely bad flavor and gulp it all. After this you will be able to reap all of the benefits.