[Avodah] Eating Two Kezeisim of Matza for Motzi-Matza

[Zev Sero]

Elazar M. Teitz wrote:

>> Definitely.  The three matzot were made from an issaron of flour
>> (a shiur chalah), and the middle one was made bigger than the other
>> two specifically so that each person at the seder could get a kezayit
>> from the smaller "half".  That makes them enormously bigger than our
>> matzot.>
 
> Pardon my ignorance, but what is the source for this extraordinary
> claim?  The halacha says that the dough used for baking matzos (of
> any size) must not be greater than an issaron, but nowhere does it
> mention that the full dough was to be used for only three matzos. 

The Ramo (OC 475:7) writes: "It is customary to make the three matzot
of the seder from an isaron, in memory of the loaves of the Todah".

The Magen Avraham (#17) cites the Ramo in Darkei Moshe quoting Mahari
Weil, that if someone has many children and a shiur chalah is not
enough he can make two doughs [of an isaron each] and join them.  The
MA understands this to mean that each dough will be used to make only
one or two matzot "so that he can give a kezayit to each one", and the
two batches will be joined together only after baking, which takes
care of the Maharil's objection that the Darkei Moshe cites.  The MA
says the Hagahot SMaK agrees, and that this is what one should do.

SA Harav (558:10) writes: "The second matzah must be bigger than the
first and third, because it must supply two zeitim for each member of
the household, one for the bracha of al achilat matzah and one for
the afikomen".  The new annotated edition from Kehot sources this to
ShuT Mahari Weil #193.

-- 
Zev Sero               Something has gone seriously awry with this Court's
zev at sero.name          interpretation of the Constitution.
                       	                          - Clarence Thomas