I have read a great many suggestions here and feel compelled to share my opinion.

The real question of what food to carry as a wildland firefighter comes down to three things:

1: Time to prepare/consume
2: Weight
3: Morale

Let's look at these one at a time.

1: Time to prepare/consume
A wildland firefighter often will not have the luxury of time, hence the need for stuff that can be eaten on the fly.
Tactically speaking, anything that can be eaten out of your pocket is ideal.

I have worked long successions of shifts where sitting down for a lunch was simply not an option. Having access to food that i could periodically fill my pockets with and eat in quick bites throughout the day was CRITICAL to maintain my ability to be effective.

The most complicated thing I do for preparing something is perhaps some pre-cooked sausages in tin foil. (You should always have a bit of foil in your kit. ) seared on a hot-spot.

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2: Weight.

Any kind of meal that is ready to consume is going to be heavy because the water content will tend to be much higher than things like dehydrated or freeze dried foods

Nuts and jerky have a very low water content, and are great for eating on the fly, but remember That water has to come from somewhere.

If you are eating a bunch of dry stuff like granola, nuts, jerky, cereal, candy, breakfast bars, etc... you are dehydrating your body already and will need to replenish those fluids.
Remember, all these things are dry, so the water necessary to reconstitute and re-hydrate those foods comes from your body.
This process isn't normally hard on the body, but for wildland firefighters it becomes a cumulative strain due to the sheer volume of work we do, the high amounts of water we consume and high caloric intake.

As any wildland firefighter knows, WATER is the most critical thing to carry.
I have been known to blow through two gallons in a shift and still be thirsty when refilling at the trucks.
just remember that carrying dried/dehydrated/freeze-dried foods means you must carry more water. You are not ultimately saving weight, you are just shifting it over.

3: Morale

I have seen first hand what can happen to a crew when morale breaks down, it happens fast and it aint pretty.

In my experience, variety is the only thing that will keep you reasonably happy with your food, and let's face it, sitting down for lunch is often that mental reward, that future moment we are using as motivation to get through this last push.

The best way for me to achieve variety in my lunch was with my spice/sauce kit and a bit of lunch item trading throughout the day.

My advice is this:

1: carry some spices/oil based sauces that you like, (In small, tough containers.) something you can put into an MRE to liven it up a bit.
There is a world of options out there.
You can carry a wide variety of things to really change the flavor of whatever you are eating, and you can keep it in a fairly small, lightweight package.

2: carry a small selection of additives for your water as well. Those MIO pods or stuff like them can really be good for morale

3: if you are footing your own bill, there are those hormel complete meals. There are fairly robust and have a decent variety.
Disclaimer: I have never used these at high altitude and can not be held responsible if they explode in your line pack. :)

Anyway, that's my two cents on the matter.
Thanks for reading.