We use the plant rhizome to make the ginger tea infusion. Peel, slice and boil. The spicier you want it, the longer it should infuse. Sometimes I allow the ginger to sit in the water overnight.
Ginger is native to India and China. It can be grown as a houseplant, or in warmer climates, outdoors. More growing info.
Do you have favorite ways to use ginger? One of my favorites it to make ginger-lemon-limeade. I replace the water with a ginger brew. I also like to punch up my chai with ginger water.