I'm not sure how to spell the pronunciation right, so I guess ress-toh-ron is the closest I can think of. Only the final 'n' is nasal, so it sounds more like the 'n' sound in 'song'.
If you're familiar with the IPA, you can check the Wiktionary entries for the French https://en.wiktionary.org/wiki/restaurant#Pronunciation_4 and the German varieties https://en.wiktionary.org/wiki/Restaurant#Pronunciation
Hope that helps!
That word means quite a lot of things. I wouldn't know right away that you meant a restaurant. http://dictionnaire.reverso.net/allemand-anglais/Wirtschaft
In a "Click the microphone and say" exercise, I said EXACTLY what the female voice said ("Das Restaurant") and it was marked wrong. Is there a way to report this? There is no background noise where I am, and I am speaking loudly enough that it hears me correctly every other time.