Lunch in Hartford on Sunday??
Vito's By the Park (Italian) is really excellent. They have a wonderful lobster ravioli. I'm pretty sure they're open on Sundays. Here's the link. ---> http://www.vitosct.com/ Also, although I've never been, my aunt said that Tapas is a really interesting Mediterranean place. Link: http://www.tapasonline.com/default.html
Good luck. Hartford is a ghost town on Sunday.
If you want a fancy lunch, the restaurant at the Wadsworth Atheneum is good. You must make a reservation.
If you can get out of Hartford, there's a Thai place in West Hartford center called Lemon Grass that's really good.
Thanks to all for the tips. Tapas was closed. Their web site said open daily for lunch and dinner. (Not a very good website, by the way.) We ended up back at the Wadsworth cafe, which was not crowded. The food was good with substantial servings. The tomato based vegetarian chile was very good. The Guinness stew was not as good as the Inn at the Long Trail in Vermont, but not bad. We'll try Tapas another time.