It's also important to note that Louis' Lunch does not take credit cards; they accept cash only.
You'll also want to make sure to visit when Louis' is open so that you won't be disappointed. As of 2014, hours are Tuesday and Wednesday from 11 a.m. until 3:45 p.m. and Thursday through Saturday from noon until 2 a.m. The owners, descendants of hamburger inventor Louis Lassen, usually close the restaurant for vacation during the second week of January, the week of Good Friday through Easter Sunday and the entire month of August, reopening the day after Labor Day. To check current hours, call 203-562-5507.