This morning Stacypants reminded me of Rhea's Market & Deli, specifically their sandwich called 19th Street:
Boar's head medium rare roast beef, vermont cheddar, pepperjack, avocado, champagne vinegar pickled jalapeños, tomatoes, pickles, baby arugula, garlic aioli, Boar's head delicatessen mustard served on Acme organic street roll
After stopping by Vega for a soy latte and chatting with the gang, I couldn't get this sandwich out of my head. So of course, I got one. Not as good as the last one I had but very good nonetheless. I think I had too much cheese on mine - the pepperjack and vermont cheddar were a little overpowering.
Anyway, you should stop by Rhea's and try one of their signature sandwiches like the Korean Steak Sandwich, Katsu Sandwich, or the Vegetarian BBQ Chicken Sandwich. The Katsu Sandwich is my favorite.