El Fogon del Gringo
$$$
If you're craving Argentina, this is the place to go. They serve all the traditional Argentine cuts, the preparation is spot-on, it's good value for the money for high-quality beef—and the salad bar is nothing to sniff at either. The service is efficient, and the wine list covers all the best local wines. Get a bife angosto (strip loin) and a bottle of Aranjuez Tannat, and you'll go home grinning. It's a little out of the way, so it's best to take a taxi.
