Claire's Corner Copia in New Haven is worth knowing about. Especially for anyone driving through Connecticut on Route 95 or with a reason to be in New Haven.
This is good home cooking of the kosher/vegetarian and vegan persuasion. The decor and atmosphere have been preserved in amber from the tie-dyed 1970's. Or, at least, they work hard to make it look that way.
It's popular, and has been there for decades. The Rav of the principal shul in New Haven supervises. It is open seven days a week.
The food is very good. Fresh bread, lots of daily specials. There were three of us and we had: fettuccine with spinach and feta, a perfectly spiced curried vegetables with rice, and squash flower pancakes with two sauces (spicy tomato cause and sour cream). Today's specials filled two good-sized chalkboards. You can see the set menu online http://www.clairescornercopia.com/
All three choices were good. It's pretty informal, but you could go with non-Jewish colleagues and not be embarrassed as long as you tell them it's a 70's style veggie place. You won't leave hungry or unhappy.
If I was driving to New England on a family vacation, I would pull off the highway, have lunch, and let the kids run around the New Haven Green. It's just off Route 95 on your route to Mystic, Newport, Cape Cod or Boston.