My wife has just started a job where she needs to bring her lunch, and she has no refrigerator or microwave at her office. I'm racking my brain trying to come up with ideas for sandwiches that I can pack up for her to bring, ones that will be OK out of the fridge for 4-6 hours and will hold up well without becoming soggy. She's vegetarian but not vegan, and tends to shy away from anything that's too spicy.
I'd very much appreciate any ideas that the collective Chowhound brain trust might have kicking around. Thanks in advance.