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MB3 148b: Chopping Salt and Grinding Meat on Shabbos (321:8-12)
Breaking apart blocks of salt with a pestle is prohibited, even for immediate use.
Cutting meat very finely with a knife is permissible (אין טחינה אלא בגידולי קרקע).
Grinding/grating cheese with a grater on Shabbos is prohibited.
Cutting vegetables very finely is prohibited.