Raw material nuts may be quenched using an extremely low temperature
liquefied gas to produce cracks in the raw material nuts. The cracked raw
material nuts may then be crumbled along the cracks to separate the nuts
into small nut fragments. After returning the temperature of the nuts to
the ambient temperature, additional cracks can be further produced in the
nut fragments by quenching the nut fragments. Smaller nut fragments can
then be obtained by crumbling along the cracks. Small nut fragments in
desired sizes may be obtained by repeating the process of cracking and
crumbling as many times as desired. The astringent skin of the nuts may
also be peeled off while the small nut fragments are produced.
