From "The Best Of Byerly's" cookbook. Byerly's is THE greatest market I have ever been to-located in St. Louis Park, MN. Just to give you an idea-they sell Waterford & Lladros as well as groceries!! ALMOST makes visiting my in-laws worthwhile:)!!Tender "pastry" bundles encase a marvelous mushroom-cheese filling. Frozen puff pastry makes prep a breeze and gives these appetizers special-occasion status.