Nikkur is the process of making an animal kosher by removing chelev and the gid hanasheh. The basis for this practice is Leviticus 7:23, "You shall not eat of any fatty suet, whether from cattle, sheep, or goats." The English word porge, or porging is from Judeo-Spanish porgar ; the Yiddish is treibern. The process is done by a menakker.