Carmello's & Little Portugal, web site, 9108 Center Street, Old Town Manassas, VA, 703-368-5522, no weekend lunch (Metro Trip Planner - opens in new window) [Washingtonian | openlist | Yelp | Gayot]
They have Italian food also, and it is expensive. I have yet to go.
A Caravela, web site, 4615 Wisconsin Avenue NW, Washington, DC, 202-537-3200, closed Sunday and Saturday lunch (Metro Trip Planner - opens in new window) [Washingtonian | WaPo | Wash Times | City Paper | openlist | Yelp]
Salt cod, in many different manifestations. I have yet to go.
Tavira, web site, 8401 Connecticut Avenue, Chevy Chase, MD, 301-652-8684 (Metro Trip Planner - opens in new window) [Washingtonian | WaPo | City Paper | food-plan | openlist | Yelp | Gayot]
Here’s my theory of Portuguese food: go to the Ironbound section of Newark, otherwise forget it, at least outside of Portugal and Fall River, Massachusetts. This place gets good reviews, but I expect it to struggle. And at $17.95 an entrée, why bother unless it is truly fine? Let me know if you go and find out.