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When Yom Tov falls on a weekday, cooking is permitted, but only to prepare food for that particular day. On Shabbat all cooking is forbidden. Therefore, preparing food for a Shabbat that follows a Friday Yom Tov presents a difficulty.
To allow cooking for Shabbat on the preceding Friday Yom Tov:
On Thursday before Yom Tov, perform the ritual of ערוּב תבְ ִׁשילִיןֵ eruv tavshilin, the combining (ערוּבֵ eruv) of the cooking for Yom Tov and Shabbat.
Start the Shabbat cooking Thursday afternoon, following this procedure:
1. Before Yom Tov begins, take two prepared foods, customarily a baked food (e.g., חַלָּה hallah) and a cooked food (e.g., a hard-cooked egg or a piece of cooked chicken or fish).
2. Recite the בְּרכָה berakhah:
,בָּרוּךְ אַתָּה יי, אֱ-לֹהֵינוּ מֶלֶךְ הָעוֹלָם, אֲשֶׁר קִדְִּשָׁנוּ בְּמִצוֹתיו
.וְצוָּנוּ עַל מִצְוַת עֵרוּב
Barukh attah adonay, eloheynu melekh ha’olam,
asher kiddeshanu bemitsvotav vetsivvanu al mitsvat eruv.
3. In a language you understand, recite a declaration that cooking for Shabbat was begun before—and will be completed on—Yom Tov.
,בָּעֵרוּב הַזֶּה יְהִי מֻתָּר לָנוּ לֶאֶפוֹת וּלְבַשֵּׁל וּלְהַטְמִין
,וּלְהַדְלִיק נֵר, וְלַעֲשׂוֹת כָּל-צְרָכֵינוּ מִיּוֹם טוֹב לְשַׁבָּת
.לָנוּ וּלְכָל-יִשְׂרָאֵל הַדָּרִים בָּעִיר הַזּוֹת
By means of this combining (eruv), we are permitted to bake, cook, warm, kindle lights, and make all the necessary preparations for Shabbat during the festival (yom tov), we and all who live in this city/locale.
4. Set aside the two foods for eating on Shabbat during the day. The cooking for Shabbat may now be completed on Yom Tov.
On Yom Tov, kindling a new fire is not permitted; however, the use of an existing fire for cooking or other purposes is permitted.
To light candles for Shabbat and Day 2 of Yom Tov (Friday night), ensure you have a fire burning before candle-lighting time for Day 1 (Thursday evening) that will continue to burn until Shabbat candle-lighting time. For example:
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