My brother is visiting from San Diego for a few days and I'd like to take him to restaurants that are quintessential Boston, or at least different or better than what they have in San Diego. I'm not too knowledgeable about the Boston scene myself being on a student budget, but willing to spend when he is visiting (Pigalle $$ - probably okay; O Ya$$$ - not ok). We are in Somerville, we have a car and are willing to drive. Recs for any meal appreciated. Thanks!