How to 'Convert' a Picky-Eater

My  5 year old grandson has a limited taste palette and he often won't eat the meals I prepare.  So .. I have been telling him about nutrition one bite at a time.  We have chats about my garden and the farm where we get some of our food.  He is now my kitchen helper washing and peeling carrots, chopping lettuce, and adding ingredients to the cooking pots.  Observing, soaking in, and hands on assistance is converting him to a boy that now enjoys carrots, milk, and even butter.  This morning I had him help churn butter in a crock.  Prior to today, he would always tell me, 'I don't like butter' .. not even hidden under jelly on toast.  After his try at making butter, I made him toast .. and he insisted Grandma not cover up 'his' butter with jelly.  We have little chats about where his food comes from each time he comes over.  That boy will one day be a discerning eater ... by golly!