During Pesach (Passover), the ownership and consumption of chametz is strictly prohibited to Jews (Exodus ch.12); so strictly that the penalty for doing so is karet, spiritual excommunication from God.
Chametz is any product made from one of the five grains (wheat, barley, spelt, rye and oats) which has come into contact with water for more than eighteen minutes, which would cause Chimutz (leavening). This includes pasta, bread, cookies, beer and non-Passover matzah, since all of them are in contact with water during manufacture.
To be kosher for Pesach, matzah must be special shmurah ("observed" or "guarded") matzah, which means that the person who made them has kept a careful eye on them before and during baking to ensure that the matzah flour (which itself has been closely guarded against contact with water ever since the grain was harvested) is in contact with water for no more than eighteen minutes before it has finished baking (once baked, the five grains cannot become chametz). The baking is often carried out by chaburas (groups) of Orthodox Jewish men.
This "guarded" method of manufacture is quite a bit more complex than the production of not-for-Pesach matzah; and so, when making matzah for use during the rest of the year, it is less expensive to make the type that are not kosher for Pesach since the Torah-laws against chametz do not apply at other times of the year.
Simply, people like to eat matzah at times that are not Passover and the process to make non-Kosher for Passover Matzot is cheaper.
Chassidim do not eat any foods made with matzah or matzah by-products where the matzah was mixed with water or any liquids before being cooked. This is because they believe that there's a chance that the matzah wasn't baked through and there's potential for raw flour to be mixed with liquid. This is referred to as 'gebrokts'.
It means that you can't eat them during Passover.
Virtually any large supermarket will have it in the Kosher food section, usually close to Passover (from March).
Instead of bread, matzos are eaten. Other foods are the same as the rest of the year, except that they should have kashruth certification indicating that they are kosher for Pesach (Passover). Leavened foods (cakes, pastries, breads) are not eaten.
Yehuda Matzos was created in 1921.
Today, we eat matzos (special hardtack prepared in accordance with Jewish law), plus wine, a sprig of parsley, bitter herbs (such as Romaine lettuce and horseradish) and haroset (a mixture of apples, wine, cinnamon and nuts), plus the holiday meal. These are had as part of the Passover Seder, in which the Exodus from Egypt is retold at length. When the Holy Temple still stood, the Passover sacrifice was part of the group meal (Exodus ch.12).
unleaven
baked ziti .... it is like a lasagna Pizza, pretzels, matzos
Yes.
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The first Passover was in Egypt
When the Israelites escaped from Egypt, they didn't have time to let the dough for their bread rise before baking it because they would get caught by the pharaoh. We eat matzo to remember this.
Passover is called "Pessa'h" in French. This is not a French word, but comes from Hebrew.