Dirt pie

clay or mud molded by children in imitation of pastry.

See also: Dirt

References in classic literature ?
After this experiment, I need not say that I wanted no sort of earthenware for my use; but I must needs say as to the shapes of them, they were very indifferent, as any one may suppose, when I had no way of making them but as the children make dirt pies, or as a woman would make pies that never learned to raise paste.
It amazes me how the average person will follow medical advice even though it does not sound logical; some people would eat dirt pies three times daily if their doctor prescribes it.