Hi there,
I've just had lunch at my desk...
A piece of bread, with avocado, small bit of mayonaise, 75 gm of chicken breast heated up, it was yummy and satisfying. I also do leftover roast lamb, boiled eggs, or a tin of tuna.
I keep the digital scales on our kitchen bench at home as I like to know how many gms of chicken, lamb etc I am eating.
This all takes a bit of preparation, but you get used to it. I prepare my husband's, kids and my lunches the night before as I am getting dinner ready, as I work 3 days and the mornings are too rushed.
Or leftovers are a good idea also.