Have you tried canned coleslaw? as in home made kilner jar type canning.
It's surprisingly good. Sweet and sour with no mayonnaise or yoghurt added, though you can drain it and add if you like.
I make 5 jars per batch, and though it never lasts long, it can last quite happily for several years in the Kilner jars. Easy to keep at hand, and very good for camping, if not going lightweight.
This was the recipe that I followed when first I made it. I admit that I add other stuff to mine now, but this is a really good basic/start recipe.
https://chickensintheroad.com/farm-bell-recipes/canned-coleslaw/
Doesn't need a pressure canner, just a big pot, and it's pretty much fuss free.
If you want to try and don't have Kilner or leparfeit jars (I'm going to get attacked for this by the canning purists, but, hey-ho) you can save and scour out the jars that come with tomato sauces and the like and simply reuse those. The Italians have been doing this for generations (long time before WW1 at least, according to my son's Italian gf) to make and store their 'red sauce' , etc., from their gluts at harvest time, so it's perfectly do-able. So long as the seal takes, and clicks in, keep the jars in the fridge and use it up within a couple of weeks.
Caveat; I'm not telling anyone to make and store for months or years using non-canning jars, but it's a decent way to try it out.
There's a lot of mince talked about these jars not 'being as thick, or as safe, or as suitable'...but you note that most of that mince comes from canning sites, and food manufactuers pressure can those very jars themselves. I have every kind of canning jar available, and a lot of them would have been thrown out as substandard by the food industry. They are uneven, and virtually all of them are now made in China. Food manufacturers demand reliable quality, not rustic. The Kilner, etc., jars are blooming expensive too.
The canning industry is now railing against traditional jam making, claiming that it's killing people with botulism....have any of you ever heard of a single incident of botulism from jam ? the worst that happens is a hangover because the stuff starts to ferment. The mould that grows very occasionally on a jar is just removed. Like bread, or cheese...but according to the canning sites that's poisonous and toxic and will KILL us
I am becoming ancient, and I'm still here