This is most definitely my favorite lunch. I work from home, so I can easily run downstairs and throw together 'the big salad' with whatever veggies that I have on hand. When I did work in an office I would make it for transport and dress it at work. Yes, I kept extra virgin olive oil and balsamic in my office, however, you can easily mix that in a small container and dress your salad right before eating it.
Pecorino Romano cheese, or you could use your favorite hard cheese.Some thin sliced fresh basil is also a nice touch.