Lunch Near Phoenix Art Museum

My wife and I (with our 14 year old daughter and her friend) will be going to the Rembrandt exhibit at the Phoenix Art Museum on Saturday. Any lunch suggestions? We don't want anything too fancy or ethnic (14 year olds), and my wife is very anti-processed foods, so chains and chain-like places (as well as any place lacking in low-fat options) are not good options. Those constraints aside, we want good food and money is not a big issue. We'll be travelling from Tucson, and lunch will be early in the afternoon, so places very near or south or the museum preferred.

Thansk.