There's not a lot, when I booked into the hospital there's a food court, there, and there wasn't much there either. It's all stodgy food..

Hot roast sandwich - beef or pork
Hot quarter BBQ chicken - take the skin off for less fat and the other stuff
Steamed rice
Baked potato

Drinks (not so much to do with listeria but healthy ones)
Plain milk
Water

That's all I can think of. The problem is although listeria is rare, it does happen and it's not killed by refrigeration. I have been warned off Subway and sandwich places.