Save your gas money: This James Beard award-winning Portland restaurant opened its second branch in the Fenway. Whereas the original is a trendy, full-service establishment, the Boston outpost offers a far more casual experience. The menu is small but potent: oysters on the half shell, crudo, tartare, clam chowder, Maine lobster stew. The fried fish sandwich is an unexpected delight but, of course, the real sandwich star is the brown butter lobster roll: a rich, nutty, singular treat, the bao-like bun soaking up all that delicious dressing. Save room for the brown butter soft serve, or maybe splurge on a second glass of wine as you savor the restaurant’s bright, clean-lined interior.