Marron glacé that a "marron glacé" is a confit marron that is covered in caramel. The 1767 book "L'agronome, ou dictionnaire portatif du cultivateur" claimed that the best marrons came from the Dauphiné region in southeastern France, and contained instructions for preparing marron glacés. Chestnuts are covered with a membrane, known as a pellicle or episperm, which closely adheres to the fruit's flesh and must be removed because of its astringency. Marron nuts have a pellicle which is "superficially attached to the nut", making it easily removable from the fruit. Some chestnuts have two cotyledons usually separated with deep grooves penetrating nearly
Joseph Marron Iancu, and Raytheon CEO Thomas Kennedy. The patent has been assigned to Raytheon. Joseph Marron Joseph Charles Marron (born 1959) is an American optical engineer and a principal engineering fellow at Raytheon. He is known for his work in developing advanced laser radar and the invention of holographic laser radar. He is a fellow of the Optical Society of America and in June 2018 was awarded the 10 millionth U.S. patent. Marron was educated at University of Rochester's Institute of Optics. He received his undergraduate degree in 1981 and his PhD in 1986. While working at the Environmental Research Institute