E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
There are certain stones on Mount Carmel called Stone Melons. The tradition is that Elijah saw a peasant carrying melons, and asked him for one. The man said they were not melons but stones, and Elijah instantly converted them into stones.
A like story is told of St. Elizabeth of Thuringia. She gave so bountifully to the poor as to cripple her own household. One day her husband met her with her lapful of something, and demanded of her what she was carrying. Only flowers, my lord, said Elizabeth, and to save the lie God converted the loaves into flowers. (The Schönberg-Cotta Family, p. 19.)