Cooking and keeping food warm for Shabbat: what is made ahead, what stays hot

In short

On Shabbat, one does not cook: cooking is one of the labors set aside on that day. Everything is made ready on Friday, before the onset of Shabbat, and kept warm on a hot plate meant for the purpose. Eating hot food on Shabbat without cooking anything is precisely part of the delight of the day. On the borderline acts (returning a pot, adjusting the heat), customs differ: that is for your rav to answer.

At a glance

An overview of the widespread practice: the precise cases are settled with your rav.

Everything is made ahead

Most of the Shabbat cooking is done on Friday: the shopping, the dishes, the table set. Once the onset has passed (the lighting of the candles), one no longer cooks and no longer adjusts the heat. This is not a last-minute constraint: it is the very rhythm of the day, where what is gathered on Friday is savored on Shabbat.

Keeping food warm: the plata and the blech

To eat hot food without cooking, already-cooked dishes are set on a heat source that was adjusted in advance:

• The plata: a Shabbat hot plate, switched on before the day comes in, with no thermostat anyone touches.
• The blech: a sheet of metal covering the burners of the stove, on which the dishes are placed.

The principle is the same: the plate keeps warm what is already cooked, it is not there to cook during Shabbat. No setting is changed once Shabbat has come in.

The Shabbat lunch dish

The hot midday meal on Shabbat is an institution of the day: a slow-cooked dish (dafina, also called skhina, hamin or cholent depending on the community) put on to cook from Friday, which goes on gently all night. By Shabbat lunch it is ready and hot, without anything having been cooked that day. It is the perfect illustration of the idea: the delight is prepared in advance.

Returning a pot, adjusting the heat

This is where the real questions begin. Taking a pot off the plate and putting it back on (chazara), moving a dish toward a hotter spot, covering a dish to concentrate the heat: all of this is bound by precise conditions, and customs differ from one community and one posek to another. These are not acts to improvise: they are exactly the questions a rav is there to rule on, according to your situation and your equipment.

What is not done

One does not cook, does not rekindle a flame, does not adjust the temperature. Nor does one prepare during Shabbat what could have been prepared beforehand. The point is not to eat cold or joyless food: it is precisely to have everything planned so as to eat well, without acting on the heat on the day of rest.

Frequently asked questions

Can a cold dish be reheated on Shabbat? That is a delicate question, and it depends on the state of the dish (already cooked or not, dry or liquid) and on the way it is done. Do not settle it on your own: ask your rav.

Does the plata have to be switched on before Shabbat? Yes, always: it is set and switched on on Friday, before the onset of Shabbat, and it is not touched afterwards.

What if I only have a microwave or an induction hob? The solutions depend on your equipment. The principle (keeping warm without cooking or adjusting) stays the same, but the practical details are to be worked out with your rav.

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Sources: this guide draws on the classical sources of Jewish law. It gives a general orientation, never a ruling that takes the place of your rav's. On any concrete case, ask your rav.