I found this lesson plan for classrooms online just now and thought it might be something that parents could adapt to use at home with their children while the various autumn harvest vegetables are still in the local grocery stores.

Eat a Rainbow: The Autumn Harvest

From their website: 

This lesson gives kids a delicious, hands-on way to remember a simple phrase that will help boost their fruit and vegetable intake.

Objective: To introduce the importance of eating a rainbow of colors of fruits and vegetables while emphasizing and celebrating a seasonal harvest.