Refers to the spice or the plant; used in cooking and beverages. Often appears in compound words like ジンジャーエール (ginger ale).
ジンジャーをすりおろして紅茶に入れた。
I grated some ginger and put it in my tea.
These cookies contain ginger.
ginger cake
gingersnap
gingerbread
Borrowed from English 'ginger'.