I've found a marvellous book I can recommend for anyone interested in encouraging children to grow and cook their own food: 'Kitchen Garden Cooking with Kids' by Australian author Stephanie Alexander. She's initiated a kitchen garden program in Australian schools (including my nephew's!) where the children participate in creating a permaculture garden and plant, grow, harvest, cook and eat their own organic food. The book tells the story of this along with 120 seasonal recipes especially written for children but equally tempting for adults. It's much more than a cookbook - lots of activity ideas and tips for engaging children and beautifully illustrated.