What is the significance of the Minchah mentioned here?
Rashi: It is Minchas Nesachim (a flour offering that accompanies an Olah or Shelamim) of the lamb.
Refer to 23:13:1:2.
QUESTIONS ON RASHI
Rashi writes that the Minchah is Minchas Nesachim of the lamb. Minchas Nesachim of a lamb is only one Isaron!
Rashi: Here the Torah doubled the usual size of Minchas Nesachim,,even though the accompanying wine libation is the normal amount. 1
Da'as Zekenim, Hadar Zekenim: The simple meaning is, one Isaron is the Omer, and one Isaron is the normal Minchas Nesachim, just like the wine is the normal amount for a lamb. 2
Da'as Zekenim: Since we find a Minchas Nesachim larger than usual, in the Musafim (Bamidbar 28:9-29:15) the Torah specifies the Shi'ur of the Minchas Nesachim, but not the Shi'ur of the wine, for it is always the same. "V'Nisko" is written with a Hei (as if it were read v'Niskah, feminine) to teach that it is the Nesech for the entire Minchah. Do not say that a quarter Hin is brought for each Isaron!
Seemingly, "Minchaso" implies that both Esronim are Minchas Nesachim! (PF)