der Ingwer
ginger
The aromatic, spicy-tasting root tuber of the ginger plant, used as a spice in cooking or as a remedy.
Ich reibe immer etwas frischen Ingwer in mein Curry.
I always grate some fresh ginger into my curry.

ginger
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ginger
The aromatic, spicy-tasting root tuber of the ginger plant, used as a spice in cooking or as a remedy.
Ich reibe immer etwas frischen Ingwer in mein Curry.
I always grate some fresh ginger into my curry.

You can easily tell from the context whether the root (spice) or the plant is meant. In recipes, cooking, or tea, it always refers to the root. In texts about botany or gardening, the plant is meant.
Für den Tee brauche ich noch frischen Ingwer aus dem Supermarkt.
For the tea, I still need fresh ginger from the supermarket.
When talking about the spice, 'Ingwer' (ginger) is usually used as an uncountable noun. To specify an amount, you use words like 'ein Stück Ingwer' (a piece of ginger) or 'eine Ingwerknolle' (a ginger root).
Kannst du bitte noch ein Stück Ingwer kaufen?
Can you please buy another piece of ginger?
Common combinations in a cooking context are 'frischer Ingwer' (fresh ginger), 'geriebener Ingwer' (grated ginger), 'Ingwer schälen' (to peel ginger), or 'Tee mit Ingwer und Zitrone' (tea with ginger and lemon).
Geriebener Ingwer gibt der Suppe eine angenehme Schärfe.
Grated ginger gives the soup a pleasant spiciness.