Or maybe it was a McDLT. I think it came out in the Fall of 2003. It was on special at just a buck. Great sandwich but when they tried to raise the price, it flopped.
Nope, I guess my memory is failing. The McDLT was a looong time ago, from this commercial (featuring ultra-hip George Costanza praising the McDLT’s ability to keep the hot hot and the cool cool):
http://www.youtube.com/watch?v=UTSdUOC8Kac
Maybe it was the Big’n’Tasty.