The Black Rose is reliable in every way: It’s a genuine Irish pub in a part of Boston where authentic can be hard to find among the tourist joints; the bar food is first-rate (you can’t go wrong with a pint of Guinness and the house-made corned beef on marble rye, hold the mustard); and there’s live music seven nights a week. Located across the street from the historic Custom House and close to Faneuil Hall, the Black Rose has thrived for 40 years by keeping it real, and you’ll find a lively crowd of locals and visitors here even on wintry weeknights to drink Irish beer poured by Irish bartenders and listen to Irish music.