I was up in Boston over the weekend and had my first Bismark, but I can't seem to find any mention of them down here. I'm willing to travel to any borough!
Here's how I attempted to explain them to my teen-age daughter:
Apparently, they only exist in New England. It's like an eclair, sorta, but only a little. It's like a straight donut, the light kind not the cake-y kind, and it's sort of in the shape of hot dog bun. At the bottom they put raspberry-ish stuff, like what's in a jelly donut, and then they put a ton of thick whipped cream on it, as if that was the hot dog.
They also seem to be known as long johns and Berliners.
Anybody seen one in the city?