Goloseo - a small Italian restaurant on Ingolstadterstrasse (10 mins walk from the U-Bahn), next to the Leierkasten brothel. Excellent little place. Although not suitable for a group of more than about 10. Always packed with top totty, all of whom are well dressed cos they work at the Fashion Textiles place opposite. You absolutely have to reserve though cos it's always busy.
Failing that there is a Chinese, right at the top of
Leopoldstrasse - just on the inner side of the Frankfurter Ring. Nothing special, but perfectly acceptable. Don't know the name, sorry, so not much help I suppose.
There is also a fairly new place which is opened in the new office blocks on Frankfurter Ring opposite the Mercedes dealers. Again, I don't know the name. So not much point bothering to tell you I suppose. Although you could ask your co-workers. Seeing as they work around there they will probably know. All the office workers go here for lunch.