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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. –  YEZ Feb 10 at 19:36
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2 Answers 2

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 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 at 6:12
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Rabbi Abadi permits it, and says it does not count as kneading:

http://www.kashrut.org/forum/viewpost.asp?mid=9753

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note in the question he is asking about precooked oatmeal. –  Gershon Gold Feb 10 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 at 17:55
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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 at 18:03
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