Need to bring main dish for 10-12 on Thursday for office potluck lunch. We have a small refrigerator that will be packed with everyone (90 people!) stuff. There is only a small microwave, so no heating possibility. I could keep a salad or some such dish cold in my car (it's 20-30 F here). The only think I can think of is a cesar salad with grilled chicken. Would like something a little more interesting and unusuual. Any thoughts? Thanks!