der Riesling
Riesling
The wine made from the Riesling grape. It is often characterized by pronounced acidity and fruity aromas.
Zum Fisch bestellte sie ein Glas trockenen Riesling.
She ordered a glass of dry Riesling with the fish.

Riesling
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Riesling
The wine made from the Riesling grape. It is often characterized by pronounced acidity and fruity aromas.
Zum Fisch bestellte sie ein Glas trockenen Riesling.
She ordered a glass of dry Riesling with the fish.

The verbs in the sentence make the meaning clear. Verbs like 'trinken' (to drink), 'bestellen' (to order), or 'probieren' (to try) refer to the wine. Verbs like 'anbauen' (to grow/cultivate), 'wachsen' (to grow), or 'ernten' (to harvest) refer to the grape variety.
In dieser Region wird seit Jahrhunderten Riesling angebaut.
Riesling has been grown in this region for centuries.
To describe the taste of the wine, 'Riesling' is often combined with adjectives such as 'trocken' (dry), 'halbtrocken' (semi-dry), 'lieblich' (sweet/mild), or 'fruchtig' (fruity).
Ich bevorzuge einen trockenen Riesling zum Essen.
I prefer a dry Riesling with food.
Riesling is one of Germany's best-known and most important grape varieties and an important part of German wine culture, especially in the wine-growing regions along the Moselle and Rhine.
Eine Reise entlang der Mosel ist ohne eine Riesling-Probe unvollständig.
A trip along the Moselle is incomplete without a Riesling tasting.
white wine
'Weißwein' and 'Riesling' both belong to the topic of wine and can refer to light-colored wine. 'Weißwein' is the general term for wine with a light color. 'Riesling' is more specific: it refers to wine made from the Riesling grape or to the grape variety itself. So you can say: A Riesling is usually a white wine, but not every white wine is a Riesling. The words can be confused when you are talking about wine in a restaurant or while shopping. If the variety does not matter, 'Weißwein' fits. If you mean this specific variety, 'Riesling' is more natural.

Ich nehme heute einen Riesling, weil ich fruchtige Weine mag.
I'll have a Riesling today because I like fruity wines.
Zum Fisch hat Maria einen trockenen Weißwein bestellt.
Maria ordered a dry white wine with the fish.