All right, not very bushcrafty, but an excellent walking food:
Chili beans.
1 onion, 1 tin chopped tomatoes, 1 tin beans, 1lb lamb mince - serves 2
Fry the onion in oil, and then add the lamb mince. When it's all turned from pink to brown-grey, pour in the tomatoes and beans. Simmer this, stirring, for 20 minutes or so. Add an insane quantity of chili. I mean really lots. This is your stew.
Now to convert it to mobile food, spread it thin on a tray, no more than 2cm thick. Dry this out in the oven for about 24 hours, if you have an Aga, put it in the bottom oven, or if you have a food dehydrator, even better. You will need to at least open the door regularly to let the steam out, preferably leave it open. When it is all dried, you cut it into cakes which you then store in ziploc bags, so that it doesn't get damp. It may look quite fatty, but don't worry, when you reheat it it's fine.
Reheating is dead easy - put the cakes in your Trangia, or billy over the fire, and heat them until they're sizzling in the fat. Then add water, slowly, so the cakes have time to expand properly. Don't put too much in, as you can always add it later but once it's in it's too late. After it's expanded, simmer it for about 10 mins and serve, with even more chili. The thing I like best about it is that you never become bored of it - I've had it for three weeks straight and used to look forward to it every day.