Cannon's Blackthorn 49 N Village Ave, Rockville Centre, NY11570 Cannon's Blackthorn, which opened its doors in 1926, is a well refined local bar and restaurant that specializes in…More Irish cuisine. It offers happy hour specials from Monday to Friday. Brunch is served on Saturday and Sunday from 12pm to 4pm, with a variety of options for $16, each of which include two brunch cocktails. The beer garden is open year round. After dark, it becomes a popular nightlife spot. Sunday is Irish day, featuring fireside sessions that include traditional Irish music.