Arukh HaShulchan, Orach Chaim 318:13-18

Sugya Map

• Issue: The definition of Tochein (grinding) regarding soft vs. hard substances.
• Nafka Mina: Whether "cutting small" (chotzech) constitutes Tochein when done immediately prior to consumption.
• Primary Sources: Shabbat 74a, Shulchan Aruch, Orach Chaim 321:10, Arukh HaShulchan 318:13-18.

Text Snapshot

"וכל דבר שאינו גידולי קרקע... אין בו משום טוחן" (Arukh HaShulchan 318:13). Note the dikduk: R' Epstein differentiates between gidulei karka (earth-grown) and mineral/animal sources. The leshon implies that the melacha of Tochein is tethered to the functional state of the substance as a "food staple" (davka).

Readings

• Rambam (Hilchot Shabbat 8:15): Maintains that Tochein applies to all items, even those not growing from the ground.
• Arukh HaShulchan (318:13): Argues against Rambam, positing that Tochein is inherently linked to the toledah of Zorei'a (sowing), thus limiting it to gidulei karka.

Friction

• Kushya: If Tochein is defined by the act of pulverizing, why distinguish by source? The to'en (grinder) performs the same physical motion regardless of the material.
• Terutz: The Arukh HaShulchan contends that melacha is not mere physics but ma'aseh ouman (artisan work). If the object is not a candidate for Zorei'a, the tikkun (preparation) is not considered "grinding."

Intertext

Compare with Shulchan Aruch 321:10, where the Mishnah Berurah (s.v. im) notes the debate regarding eggs or meat, aligning closer to the stricter view of the Rambam despite R' Epstein’s leniency.

Psak/Practice

The Arukh HaShulchan’s chiddush provides a robust kulah for modern kitchen dilemmas involving non-vegetable proteins. However, the minhag remains strict. In the spirit of Av, we minimize complexity; if it looks like grinding, avoid it—even if the Arukh HaShulchan offers a theoretical path of exit.

Takeaway

Tochein is not about the action, but the nature of the entity being acted upon; if it didn't grow, the melacha remains a conceptual boundary rather than a physical prohibition.