When Rosh Hashana occurs on Thursday and Friday, an eiruv tavshilin must be prepared on the preceding Wednesday. The head of the family should take bread or matzoh and an item of cooked food such as meat or fish, put them on a plate and say the following berachah:
בָּרוּךְ אַתָּה יְהֹוָה
Blessed are You, Adonoy,
אֱלֹהֵֽינוּ מֶֽלֶךְ הָעוֹלָם
our God, King of the Universe
אֲשֶׁר קִדְּשָֽׁנוּ בְּמִצְוֹתָיו
Who sanctified us with His commandments
and commanded us
עַל מִצְוַת עֵירוּב:
concerning the mitzvah of eiruv.
By means of this eiruv
יְהֵא שָׁרָא לָנָא.
it will be permissible for us
לַאֲפוּיֵי וּלְבַשׁוּלֵי וּלְאַטְמוּנֵי
to bake, cook, keep dishes warm,1“Keeping dishes warm” means that we are permitted to place cooked foods on a covered stove in order to preserve their heat. An example of this is the traditional Cholent.
to kindle a light (from an existing flame),
וּלְתַקָנָא וּלְמֶעְבַּד כָּל צָרְכָנָא.
and to prepare and do all our necessities
מִיוֹמָא טָבָא לְשַׁבַּתָּא.
on the Festival for the needs of Shabbos,
לָנָא וּלְכָל יִשְׂרָאֵל
for us and for all Jews2The Rav of the community usually includes the community in his eiruv. This can be done however by anyone. It is done by handing over the cooked food to another person through whom he grants a share of the food (of the eiruv) to the entire community. This person raises the eiruv a tefach, (handsbreadth) and returns it to the one making the eiruv.
הַדָּרִים בָּעִיר הַזֹּאת:
who live in this city.
The food of the eiruv should be eaten at one of the Shabbos meals.