If you're over 21, summer in Bismarck isn't complete without a clam digger from the Broken Oar in Mandan, ND.
From what I can tell, a clam digger is basically a salad in a class, with some alcohol. The clam digger is made over ice, including a pickle, green olive, yellow peppers, seasonings, hot sauce, Worcestershire sauce, Clamato and vodka. They are delicious. I think clam diggers are cousins to bloody marys and caesars.
Let's toast to summer.
I've never seen these anywhere other than the Broken Oar Bar in Mandan, ND, so I deem it a Weird North Dakota Food (WNDF).
Added June 2, 2009: It has been brought to my attention that Mandan's Broken Oar bar is certainly not the first or only location that serves clam diggers. But since the clam digger is a tradition at the Broken Oar, I decided that it will remain a WNDF.