Food is a big part of daily life. It is also a big part of learning English. Young and Very Young Learners will always cover food at least once in ever course. Stories are a great way to engage students, improve their reading, listening and comprehension skills and enjoyable.
The Hungry Caterpillar is a great book and I am sure you have all read it at some stage in your lives. It covers a lot of food and can be a great teaching aid.
The Hungry Caterpillar Colouring Book is a great follow up activity of the story. The caterpillar is coloured on all the pages (except the first) and the fruit has been left blank for your students to colour as they wish (hopefully they will choose the right colours for each fruit but there is nothing wrong with younger learners choosing their own). It works well as a focus task and, although it does take a while, gives students a real sense of achievement and something tangible and personalised for them to take home.
I would suggest that you cut up the pages for them, unless you have unlimited time and students who are capable of welding scissors!