One who makes a neder prohibiting “meat” is permitted meat juice and jelled meat juice; R' Yehudah, however, forbids [them]. Said R' Yehudah: It happened that R' Tarfon forbade me the eggs which were cooked with it. They said to him: It is true! When? At a time that he says: “This meat to me,” because one who prohibits a thing with a neder and it mixes with another thing —- if there is enough to give a flavor, it is forbidden.