Adding Water to Rice on Shabbat
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Question
Is it permissible to add water to cooked rice on Shabbat and heat it in an already lit oven?
Answer
Hello,
It is forbidden to heat water on Shabbat. Therefore, it is prohibited to add cold water to a dish and heat it on Shabbat.
Adding boiling water to a fully cooked dish is permitted.
It is allowed to add boiling water from a kettle that is on the fire, or from an electric kettle with the heating element on, into a hot dish that is on the fire.
Aside from the issue of heating water, one must be aware that placing a dish into an oven usually involves activating and deactivating heating elements. Thus, even if adding water to the dish is permitted, it is often forbidden to place the rice in the oven.
Source
Shulchan Aruch, Orach Chaim, Siman 318.