Ginger tea : By yuparat chumporn No. 41

"Ginger"

Ginger is the underground rhizome of the ginger plant with a firm, striated texture. The flesh of the ginger rhizome can be yellow, white or red in color, depending upon the variety. It is covered with a brownish skin that may either be thick or thin, depending upon whether the plant was harvested when it was mature or young. 
reference ::
 http://www.umm.edu/altmed/articles/ginger-000246.htm