My family traditionally begins the evening meal with a prayer of thanks.  When they were old enough, we began letting our children say the meal prayer.  Of course at first they would ask for a pony, a new bike, etc.  They soon learned the more important things which should be included in the prayer.

At Thanksgiving we had the whole family over.  My nine year old wanted to say the prayer.  It went like this:

"Heavenly Father, we thank Thee for the turkey, the rolls, the mashed potatoes, the red jiggly stuff, and the bread stuff even though I don't like it.  We ask that You not let us choke on this food."