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May one make oatmeal on Shabbos? It is easy to take care of the bishul problem by using a kli shlishi (according to Igros Moshe OC vol. 4 74:15 and others who hold that there is never bishul in a kli shlishi), but does mixing the oatmeal with water constitute Losh (kneading)?

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  • I was going to point out that R' Moshe on your behalf as well.
    – Y     e     z
    Feb 10, 2014 at 19:36

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In terms of Losh - Rabbi Kagonoff writes:

WHAT IS LOSH?

The concept of losh is to combine fine powders or similar small items into a unit by adding liquid (Shevisas HaShabas). Thus, mixing clay for pottery, or cement and sand into concrete, violate the Torah prohibition of losh (see Rambam, Hilchos Shabbos 8:16; Rashi, Shabbos 74b). Similarly, mixing oatmeal or reconstituting instant mashed potatoes violates the Torah prohibition of losh (in addition to whatever prohibitions of cooking may be involved).

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    Would this not depend on how thin/thick the oatmeal is?
    – Ephraim
    Feb 10, 2014 at 20:56
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    I don't know why that would be. Oatmeal isn't a powder. In siman 321 there are many mutar cases similar to oatmeal. Kemach Kelli, Shesisa, Matza meal... Anyway, rabbi kagonoff is not really a source.
    – Ish Ploni ViKohen
    Feb 11, 2014 at 6:12

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