Abstract: 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.

Abstract: 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.

Abstract: An anti-oxidation technique for treating raw foods, such as nuts and seeds, so as to make them oxidation-resistant. In the technique of the present invention, foodstuffs such as nuts, seeds, etc., are heated under pressure in a tightly closed vessel, so that the texture of the raw food materials is slightly softened, and so that the moisture activity value is at the same time adjusted to a value in the polymolecular-layer moisture region of approximately 0.3-0.4. As a result, the water molecules are absorbed on the surfaces of the lipid molecules so that a polymolecular layer of water is formed and strong bonds between the water and proteins act synergistically to prevent penetration of oxygen into the interior texture of the foodstuff, such as nuts, thus conspicuously hindering oxidation.