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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 ez Feb 10 '14 at 19:36

Rabbi Abadi permits it, and says it does not count as kneading:


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note in the question he is asking about precooked oatmeal. – Gershon Gold Feb 10 '14 at 17:44
The answer does not seem to be dependent on whether the oatmeal is precooked. kashrut.org/forum/viewpost.asp?mid=9761 In any case, instant oatmeal is not precooked -- it is lightly steamed and then cut into very small pieces. – Kordovero Feb 10 '14 at 17:55
I have sent Rabbi Abadi a question as to whether there is a difference according to him if not precooked. Will post when I receive answer. – Gershon Gold Feb 10 '14 at 18:03
@GershonGold Anything yet? – Shokhet Jan 14 '15 at 22:10
@Shokhet: If I had received an answer it would of been posted. – Gershon Gold Jan 15 '15 at 13:49

In terms of Losh - Rabbi Kagonoff writes:


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 '14 at 20:56
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 '14 at 6:12

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