Mixing a Shake on Shabbat
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Question
Hello, Honorable Rabbi. I would like to prepare a shake for Shabbat. The shake consists of blended fruits mixed with soy milk. Is it permissible to crush the fruits on Friday and mix them with soy milk on Shabbat itself?
Answer
It is permissible to mix on Shabbat, but you must change the order of addition that is customary on weekdays. If the usual practice is to add the fruits first, on Shabbat you should add the milk first. Additionally, you should change the method of mixing, meaning insert a spoon and move the mixture to one side, remove the spoon, then insert it again and move to the other side. Also, if you usually mix with a spoon, you may mix by shaking the vessel, or vice versa.
Source
Shulchan Aruch, Orach Chayim 321:4