Camp Mash
This recipe is the byproduct of two young brothers camping who couldn't be stuffed a) bringing more than 1 billy-pot & 1 frypan b) washing more than the billy-pot & frypan...

1x 200g tin of Tuna in Freshwater (if you have oil or brine you need to drain it)
1x 30g packet of dried peas (get the minted ones if you want to feel fancy)
1x 30g packet of dried carrot
1x packet of "Deb" (instant mashed potato)
some Long-Life Milk (those things are awesome for camping)

Start cooking the tuna in the pan. Make sure it goes that gentle brown-ey colour.
Boil water in the billy-pot and cook the dried vegetables in there.
WITHOUT removing the dried vegies, start making the instant mashed potato in the billy-pot. (Use the milk if you want it to taste creamier)
Once the mash is ready, transfer the tuna to the mash-mix. Stir it through and make sure everything is well mixed.
Serve and eat.

Doesn't look fantastic, but it's seriously awesome for camping music festival food... Fish, vegies, milk... and minimal prep/cleaning.