It can be hard to find somewhere casual in the Seaport where you won’t spend the same amount on drinks and dinner as your weekly grocery run. If you just want to hang out with friends and have some good cocktails, head to Lucky’s, an underground bar on Congress. It feels a little like a speakeasy when you walk down the stairs into the dark room, but without the whole ice cubes engineered in a lab or fake entrance through a restaurant setup. Instead, the room looks like your friend’s cool dad’s basement bar, with groovy starburst lighting fixtures and lots of random kitsch. The burgers are messy and great, as is everything on the starters menu, particularly the pork belly bao buns and chicken empanadas.