I have had Cobble Grill's Skirt Steak Sandwich three times in a week. (Every winter I get into a "beef phase", and can't get enough of the stuff.) Their good (if not transporting) sandwich is made with, you've guessed it, skirt steak (medium rare seems to be the standard level of doneness, which is just fine with me) on ciabbatta (sp?) bread, onion relish, and a subtle horseradish mayonnaise (I would have preferred more of a horseradishy bite, but that's just me) and either pretty decent fries or a generous portion of green salad (good, zesty vinaigrette). For some $8 total this is a really good deal, and it's a pretty big meal too. Husband had the blue cheese burger and liked it as well. I plan to try more items from the interesting menu, as I am beginning to like these guys - there's definitely space for more good, inexpensive, unpretentious but somewhat ambitious (they have slightly unusual ingredients in most entrees) joints like this in the neighborhood.
Cobble Grill is pretty much takeout/delivery only. They are at deGraw and Henry.
Oh yes... if anyone wanted to advise me to patronize Zaytoons instead, rest assured, I do. But they don't do steak sandwiches.