here is an old thread Ive found :
every time Ive had the Parisienne they had mashed potatoes 'piped' around the dish before the broiling
I can't find a pic !
this is the only one Ive found :
http://www.bbcgoodfood.com/recipes/3236/scallops-with-mushrooms-and-white-wine-coquilles-s
the M.P.'s are around the central scallops.