It's been a while since I've been there but the Tom Yam near the Montchoisi roundabouts was always reliable

Restaurant-thaïlandais Tom Yam


Chemin de Chandieu 12, 1006 Lausanne/VD
021 616 09 41

Another standard is the tennis club at Vidy

Restaurant du Tennis Club Stade-Lausanne


Avenue de Rhodanie 53, 1007 Lausanne/VD
021 616 26 87


One that is making a lot of noise but which I haven't tried yet is in teh Hotel Alpha

Hotel AlphaPalmiers


Rue du Petit Chêne 34, 1003 Lausanne/VD
021 555 59 99

Bon appetit