I think, since Delia somehow managed to find tomato soup + egg + cheese + bread to be disgusting, the safer question to start with would be what do your kids actually eat without complaint? Because if I know what I have to work with, I know what I might be able to suggest!

Or do your children receive nutrition through photosynthesis? :D Wouldn't that be perfect and handy? "You're hungry? Go stand in the yard for an hour." Hee!