One of the best and oldest methods of sneaking vitamins and minerals into kids' meals is through pureed vegetables. Standard kid fare is full of sauces just waiting to hide all kinds of purees. Marinara sauce, for instance, is a perfect camouflage for well-blended zucchini and carrots. Yogurt and white beans fold beautifully into tuna and chicken salad sandwiches to cut fat and increase protein content. What's more, vegetable purees are easy to make and then freeze for later. Just defrost and stir them in when you need them. While sneaking vegetables into kids' favorite foods is a great way to keep them well-fed, the results can be disastrous if you're caught. So, be careful out there. Finding out they've been tricked is a quick way to permanently turn kids off to healthy foods.