It involve frying pigs tails! The guy who wrote the book reckons his kids like chewing meat off bones. 
I shuddered a little when I read that. I thought for sure it was some kind of spin-off of pigs in a blanket and the like.
As for lunch ideas, does he like mexican food type stuff? You can avoid dairy and all that by making little grilled burrito-type things. (then again I have no idea if you can find tortillas easily in the UK! you can also use pitas though)
So usually I put a variation of some/any/all of the following:
beans (black, pinto, or refried)
ground meat (can be beef, turkey, or pork as all taste good. You could also cheat with ground tofu replacement. I don't know what it's called)
tomatoes
oignons (green or regular)
shredded soy cheese
avocado (sliced, cubed, or mashed up, works all ways)
mushrooms
lettuce
I put my ingredients in a warm burrito sized tortilla (sticks better when you fold it), fold it up as tightly as possible (like at Chipotle), and put it on a non-stick skillet pan. I don't use any butter or oil, but you could use some if you prefer. Then I just wait for it to char a little on the outside and take it back off. Afterwards, I put it directly into some foil and put it in my purse. At lunch I pull it out and eat it at my desk because you can just peel the foil off and eat as you go. All the stuff can be prepared before hand and just thrown together in the morning. I make a lot of salads so I usually have cut up stuff around. I can see how this might be time consuming though if you don't usually.
