Sandwiches from a celebrity chef. New locations of expanding chains. Pop-up specialty lunches. No matter what the lunch customer is looking for, D.C. has something new to offer. Particularly if it involves pizza. Here are more than 20 new places to consider for lunch, whether it be new restaurants or those who have revamped their mid-day offerings. And there are more on the way — look for lunch service from Rural Society and GRK coming soon as well.