In the original story, a girl named Lily is given an impossible task by her cruel stepmother of filling a sieve with water from the Well of the World's End or else never return home; with the help of a frog who tells her how to line the sieve with moss and clay, Lily is able to complete the task but must now keep her promise to do whatever the frog asks for one day; the frog has Lily lift him onto her knee and make him supper, much to the delight of her scheming stepmother.