Ich hätte gerne ein Glas Rotwein und einen gemischten Salat.

Pronunciation: Ish HET-uh GER-nuh eye GLAHS ROHT-vine oont eye-nen guh-MISHT-en zah-LAHT.

Meaning: I would like a glass of red wine and a mixed salad.

This polite phrasing using the conditional "hätte gerne" (would like) is the standard way to order in German restaurants and shows respect to the server.