If you are in the mood for chocolate, get their chocolate bread pudding for dessert. it's one of their staples and it is wonderful.
edit: they also change their menu seasonally and frequently, so it's tough to keep track with what to order. However, they do have staples that are on year-round, or variations of a staple (chocolate bread pudding being one of them). Regardless, I've always had an excellent meal at Blue Hill.