To introduce your children to the pleasures of food and cooking, there's nothing like preparing dishes together.
Take care though, because the kitchen can be a dagnerous place! Accept that certain techniques will require a few attempts, such as cracking eggs.
More often than not, children enjoy cooking anything that tastes sweet. Start off with a simple, fun recipe then go for something that's original but a little more challenging. Once they're used to helping out with the cooking, help them prepare a dessert that you'll serve to all the family, so they'll feel proud.