Study Guide Berakhot 48 At what age/stage can a minor join the zimun? Can you join a zimun if you only ate vegetables? If so, how many of the participants can be those who only ate vegetables (in a case where we have ten and can add God's name)? A story is told of King Yannai who after having killed all the rabbis finds one rabbi still alive who can lead the zimun so he summons him, Shimon ben Shetach. However, he doesn't offer him food so how can he lead the zimun? Is there a difference between the foods one needs to eat to allow one to join a zimun and leading a zimun. What are the blessings of birkhat hamazon? Is the fourth blessing inherently different from the others? Was it instituted by the rabbis? If so, why? From where is it derived that birkhat hamazon is from the Torah?