My four-year-old son likes this project, because he gets to eat the results. And he can have pie pretty much whenever he wants because, unlike yours truly, he doesn't need to watch his weight right now.
This morning, as he's eating a piece of Brown Sugar Pie (it's really good - post coming tomorrow!), he looks up at me and says:
"Dad, you're a good piemaker."
He's actually eating a latke here, but you get the idea.