Is there any thing else to do or is it just a case of poring over recipe books and making big batches of stuff? I am in the UK
What kind of salad do you make?
I'd suggest ensuring you use a wholemeal or wholegrain starch base to fill you up.
This is the kind of stuff I like:
Wholewheat pasta shells, sweetcorn, finely diced red onion, sliced mushrooms, creamy mayo style dressing.
Brown rice, peas, sweetcorn, crushed hazelnuts, spring onions, finely diced red and green peppers, tomatoey dressing.
Hummus and pitta breads.
Chunky barley and root vegetable soup with thick sliced wholemeal bread.
Mini pizzas made on pitta breads, topped with tomato puree, grated cheese, sliced onions, sliced tomatoes, oregano.
The sky is purple and things are right every day
peanut butter sandwiches, trail mix, pasta salad, burritos, beans and rice bowls, potato salad, hummus.
You can take a look at this thread https://www.veggieboards.com/a/over-100-vegan-packed-lunch-ideas I also like the microwave rice bowls that you should be able to find at your local grocery.You could add dressings,proteins,and veggies to them and just microwave.
If you are into fresh/uncooked food, try also bringing zucchini spiralized into pasta with a marinara, pesto, or Asian-style nut-based sauce and/or add some nuts to your salad. You can also bring sprouts and sweet fruit. My guess is you're running low on carbs. You're going to need either more carbs or more fat. So bring 600+ calories of sweet fruit, or in the alternative, add some nuts/avocado to your salad.
If you still like the taste of meat and you are only giving it out for ethical reasons, you should take a look at meat imitations. Keep in mind that not all of them are very good and most of them are a bit different but it helps to fix any meat craving you might have without having to hurt any animal.
I like to compare eating fake meat to wearing a condom. It's almost like the real thing, not quite, but close enough to satisfy you without the problems that come with it.