Maitre Delish was a famous legendary chef. He made a cookbook a book that teached anyone how to be a pefect chef. Not much was known about him, however he was mentioned in Paper Mario: The Thousand Year Door, however never seen.
One of the copies of his book was left in the Creepy Steeple, which Mario later found.
Wonky in Herb T.'s place, found in Rogueport Sewers makes a reference saying that he once ate food made by him in Poshley Heights.