Terfass is a Moroccan delicacy. Available in Can.
Those white truffles are Kosher Mehadrin for Passover under the supervision of Maor Hachacha and Badatz Beit Yosef. It is Bishul Yisrael.
Terfass are fungi (mushrooms below the ground) mainly cultivated in Eastern Morocco. It is a rare product.
They are also called desert truffles, terfass, terfas, terfesse.
Store the can at room temperature in a dry place before opening. Once opened, keep cool and use within 2 days.
You can prepare Terfass dishes with lamb, potatoes, couscous, omelette or you can cook those best recipes:
https://moroccofood.wordpress.com/2013/07/02/amb-tagine-with-white-truffles-terfass/
http://epicurean-traveler.com/ifads-recipes-for-change/
or more recipes in French:
http://nabel68.over-blog.com/2015/03/truffes-terfess-en-sauce-blanche.html
https://dafina.net/forums/read.php?54,88696,88712#msg-88712
https://dafina.net/forums/read.php?54,110144
https://dafina.net/forums/read.php?54,110062,110145