Inexpensive, authentic cuisine in Lisbon

[alicem]

We are traveling to Lisbon on a budget and we would prefer to dine in family operated restaurants that offer authentic Portuguese cuisine. We are staying in the Bairro Alto/Chiado neighborhood. Any recommendations ?

[monchique]

Lisbon is well covered on this board, for example http://chowhound.chow.com/topics/844779
Try a search for "Lisbon" on the right at the top of this page...