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Did you mean parsley, rather than lettuce? Parsley dipped in salt water is eaten as a rememberance of the salty tears shed by the Israelites (Though they weren't called that then) because of the hardships endured in Egypt.
One of the "appatizer" courses of the traditional Seder meal is a green vegetable (frequently parseley, but I suppose lettuce would do) dipped in salt water. Tradition holds that the salt water represents the tears of the Hebrew slaves. This fits into one of the main purposes of the Seder ritual, to recall and to some extent relive the experience of liberation from slavery.
On Passover, no leavened bread can be eaten. Many people have the custom not to eat legumes because their flour looks very similar or sometimes a little grain may get mixed into them.
salt water symbolises the tears of the israelites.
The main reason Jews eat Matzoh in Passover to commemorate the Jews' exodus from Egypt. Since the Jews were forced to leave in a haste they hadn't had time to wait for the bread dough to rise and as a result the bread was flat. Therefore, Jews eat Matzoh to remember the exodus. Jews start eating Matzoh on the first night of Passover at the Seder meal until the end of passover. All other products made of grains are prohibited during the holiday, but some secular Jews do not abide by this prohibition. This is one of the Jewish customs in Passover that symbolizes freedom and humility for the Jewish people.
Salt water
Salt water symbolises the tears of slavery.
All salt is kosher unless something is added to it to make it not kosher. Like all other seasonings, the specific package must be certified kosher for Passover.
Salt Water at the Passover seder symbolizes the tears shed by the ancient Hebrew slaves.
the ingredients in pickle juice are vinegar and water, salt, dipped cucumbers and more
if a magnet gets dipped is salt it loses some magnetism this can be experimented if you put iron filings in a plastic cup filled with water, you will see the water loses its magnetic field and wont see much movement at all.
it is probably their tradittion to soak meet in salt.