I have a hard time getting my son to eat his vegetables. So (and I'm stealing this idea from Bearno's spaghetti sauce) I microplane some carrots into spaghetti sauce. He can't tell it's there (what kid doesn't love pasta?) and gets an extra serving of veggies!
We were eating at Bearno's and I noticed there were bits of carrot in the marinara. With the microplane they are smaller, but you can get more in there and because of the color of the sauce the kids can't tell.