Hole in the wall joints near Hartford ct.
Le's Vietnamese Restaurant, 980 Main St, East Hartford
Kien Oriental Market, Park Rd., Hartford
Note: Le's is an actual sit-down restaurant (not fancy); Kien is definitely a hole in the wall JOINT with counter seating at the back of the store. Both delicious!
More info on both places here:
ETA: How far from Hartford are you willing to travel? Lots of possibilities may open up depending on your answer.
A little out of the way, but I highly recommend Pucci's on Highland Avenue (Town Plot section) in Waterbury. It's a tiny place - five or six tables - and BYOB. The food is Italian and excellent. Our group of seven last Saturday had everything from pizza to pasta dishes to chicken and veal. Everyone loved the food, and the bill was $140.