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רבי אמנון מזהיר: "השנה תהיה גורלית
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There is a minhag to eat Kreplach, meat covered with dough, on Erev Yom Kippur. The Minhag Yisroel Torah brings from the Geulas Yisroel that the reason is because Erev Yom Kippur is a Yom Tov, but it is a hidden Yom Tov as we are allowed to do Milacha on this day. Therefore we eat meat which is a Mitzva to eat on Yom Tov. However we hide it inside the dough, as our Yom Tov is concealed in a day of Milacha.
This also explains why we eat Kreplach on Hashana Rabba and Purim which are also Yamim Tovim although work is permitted on those days.
He also brings from the Zera Kodesh that meat symbolizes Din and the dough represents Rachamim. We take the din of Yom Kippur and we wrap it in a layer of Rachamim to ask Hashem that even if we are given a harsh judgement it should be coated in mercy.