Our family is planning a week in D.C. the end of April. The older generations are all foodies and enjoy every type of good food. However, we have a 6 and 1 year old. Since the object is to get together, babysitters are not an option. We will be staying in Foggy Bottom and will be using public transportation. Any recommendations for lunch and dinner, mostly inexpensive, with a possible splurge or two?