Costa Del Sol - Las Margaritas Bar and Grill
Las Margaritas Bar and Grill (formerly Costa Del Sol), web site, 4906 Fairmont Avenue, Bethesda, MD, 301-656-2561 (Metro Trip Planner - opens in new window) [City Paper | Chef Moz | openlist | Yelp]
They claim to be Honduran as well as Salvadorean and Mexican. Maybe, but you would have to read Leibniz on the identity of indiscernibles to prove the point. One of the few really ethnic places in Bethesda, plus it has above average pupusas. I also like the black beans soup with onion.