Here are mine, in no particular order (and, of course, only limited to restaurants for purposes of this question):
the soft shell crab sandwich at Hungry Cat
steak tartare at Anisette
beef roll at Mama's Kitchen
pork belly at Robata-ya
foie gras at Robata-ya
I can't believe two of my top five bites were at Robata-ya, especially when I've been eating out so much this past year with manbitesworld (http://www.manbitesworld.com/), but that pork belly is ridiculous, as is the foie gras.
I'd love to hear others...