The Bracha on Eruv Tavshilin is Al Mitzvas Eruv.
On
Yom Tov, one is permitted to prepare food for that day, however not for the following day. If the following day is
Shabbos, one is permitted to prepare food on Friday for
Shabbos, as long as an
Eruv Tavshilin was made before Yom Tov. The procedure is as follows.
On
Erev Yom Tov (Wednesday or Thursday), the head of the household, should set aside a baked item such as bread or
Matzah,
and a cooked item such as meat, fish, or eggs (i.e. a food that is eaten along with bread). Each item should be at least the size of one
Kezayis, preferably the size of one
Beitzah. He or she should then recite the blessing of עַל מִצְוַת עֵרוּב and then recite בַּהֲדֵין עירובא. The foods for the
Eruv should be set aside and may be eaten on
Shabbos.
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