In the George Eells biography of Porter, The Life That He Led
, the genesis of the song is attributed to a remark made by his friend Monty Woolley on board a ship in or just off Rio Harbor. Porter was watching the dawn break and said to his wife "It's delightful"; she replied "It's delicious," and Woolley chipped in "It's de-lovely."
Later, Porter told the same story substituting mangosteen melon for the dawn.
Alexander Baron - London, England, for above 2