▁pat ented ▁and ▁cert ified ▁go ose - ▁and ▁du ck li vers ▁without ▁force - feed ing ▁but ▁up ▁to ▁the ▁same ▁standards ▁as ▁the ▁traditional ▁fo ie ▁gr as ▁is ▁the ▁German ▁company ▁Fo ie ▁Roy ale . ▁The ▁products ▁of ▁Fo ie ▁Roy ale ▁are ▁being ▁used ▁by ▁several ▁Michel in ▁star ▁che fs ▁throughout ▁the ▁world . ▁Fo ie ▁Roy ale ▁developed ▁a ▁process ▁together ▁with ▁the ▁German ▁Institute ▁of ▁Food ▁Techn ologies ▁( DI L ) ▁to ▁get ▁the ▁same ▁result ▁as ▁the ▁traditional ▁Fo ie ▁Gr as , ▁but ▁without ▁the ▁force - feed ing . ▁ ▁Human ▁ob es ity ▁and ▁micro bi ome ▁studies ▁led ▁French ▁research ers ▁at ▁a ▁startup ▁company ▁called ▁A vi well ▁to ▁use ▁prob i otic ▁prepar ations ▁to ▁produce ▁fat ty ▁li vers ▁in ▁ge ese ▁over ▁ 6 ▁months ▁without ▁forced ▁feed ing . ▁ ▁Pre par ations ▁ ▁Gener ally , ▁French ▁prepar ations ▁of ▁fo ie ▁gr as ▁are ▁made ▁over ▁low ▁heat , ▁as ▁fat ▁mel ts ▁faster ▁from ▁the ▁traditional ▁go ose ▁fo ie ▁gr as ▁than ▁the ▁du ck ▁fo ie ▁gr as ▁produced ▁in ▁most ▁other ▁parts ▁of ▁the ▁world . ▁American ▁and ▁other ▁New ▁World ▁prepar ations , ▁typically ▁employ ing ▁du ck ▁fo ie ▁gr as , ▁have ▁more ▁reci pes ▁and ▁d ish ▁prepar ations ▁for ▁serving ▁fo ie ▁gr as ▁hot , ▁rather ▁than ▁cool ▁or ▁cold . ▁ ▁In ▁Hung ary , ▁go ose ▁fo ie ▁gr