Reference for Shabbat 148:1

דשלקי ליה שבעא זימני ואי לא שקלי ליה מסרח וכפסולת מתוך אוכל דמי:

because they are boiled seven times, and if one does not remove it [the edible portion], it goes rancid, hence it is like [picking] the non-edible out of the edible.<span class="x" onmousemove="('comment',' Which is forbidden. ');">¹</span> GRINDING. R. Papa said: He who cuts up beets very fine is liable on account of grinding. R. Manasseh said: He who cuts chips [for fuel] is liable on account of grinding. Said R. Ashi: If he is particular about their size, he is liable on account of cutting.<span class="x" onmousemove="('comment',' Sc. Hides to measure; v. Mishnah on erection. ');">²</span>

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