Birkat HaMazon: Seating for Minyan or Mezuman

You may join with other men to make a minyan or mezuman (a mezuman is any group of 3 or more Jewish men 13 years old or older and so a minyan is also a kind of mezuman) for birkat ha'mazon if, while you are eating:
  • You can see any other tables at which the other men are eating, or
  • You had the same waiter as the other men, even if you could not see the rest of the group (such as in an L-shaped room).