Vegetarian here

My go to low calorie lunch is cous cous (roast with a veggie oxo crumbled in), roast vegetables and either Quorn chicken fillet or steak strips for protein.
I also have a lot of salads, Quorn crispy nuggets, or mixed bean salads and boiled potatoes bulk it out.

I tend to basically do the same for me as I do for my meat eating partner, but with a veggie substitution. I do eat a fair bit of cheese and eggs for protein, but am trying to cut back on these and have beans and pulses instead. :-)

You are welcome to take a look at the Eat to Live group. We share recipes and recommendations on a regular basis, all of them vegan:

https://community.myfitnesspal.com/en/group/100425-eating-to-live