My sister and I are coming to look at grad schools (especially Georgetown) in early June. I've been to DC a few times-she's never been. I'm getting married in October so the whole trip is not in my budget, and she's a starving student, but we both love love love to eat good food. Where should we go? We like all types of food (I'm not a huge fan of Chinese...)What are the best places to spend four days of eating with under 15 dollars a meal? We're going to be relying on the metro to get around.