I had never thought that plain mushroom could enhance the flavor of a simple sandwich until one Sunday when my sister's student brought us some mushroom sandwich. I was curious as to how boiled mushroom taste in sandwich so I opened the pack soon as the girl handed it to me, took one piece and ate. The first thing I felt at first bite was the smoothness of the champignon. The taste of mayo, cheese and mushroom was unbelievably delectable. I will have to ask the girl's mother where she bought it because I want to eat some more.