The Diamondback Tavern in Ellicott City gets a positive post from guest blogger Robert of Cross Keys on Dining at Large. He talks up the "testudo" -- a sandwich with pulled pork, sauteed bananas, onion, and avocado that someone had mentioned to me. (Although I can't find the comment now.)
To date, I have gotten mixed, although pretty skeletal, reports on the Diamondback like these. I have a Restaurants.com coupon to use.
If you're adventurous enough for the testudo, consider other unusual sandwiches like the bulgogi panini at Riverside Coffee.