A while back the "Desert Moon Café" on King St. (near Atlantis) closed. No big loss, their food tended to be dry and bland. Apparently about 3 months ago, in the same spot, a new Mexican restaurant opened up:

A short trip from the Zoclo through narrow winding streets, past mission churches sinking with the city on foundations built long ago upon an ancient lakebed, will bring you into the Calle Tacuba, the site of the longest running restaurant in the city--Café de Tacuba-- founded in 1912. It is here that the idea for Tacuba Cantina was born.

[ Tacuba - History ]

OK, their marketing copy is a bit over the top. And they only have one location, yet already have a guy in charge of franchising. Very audacious goals, I think. However, I do think it's one tasty place. I've only been once (today), and it was serendipitous, but the #5 combo was rather good. I got an order of chips too, and I can vouch for their salsa (even if the chips are a bit odd, they're actually chili dusted tostadas). And drinkers will be even happier, their selection of Tequila must be the biggest in the DC area.

Their website doesn't mention it, but they have 2 other menus too. A rapido lunch menu, and a brunch menu. If you have never had a Mexican brunch, I highly recommend it. Huevos Rancheros is a great way to start a weekend. Their brunch is available 11-3 Saturday and Sunday.