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What is Included?
- One should take the bottom Matzah and eat it together with Maror and dip it in Charoset and then wipe the Charoset off.  Some say not to dip the Korech in Charoset at all.  If one forgot to dip in charoset, and finds it difficult to repeat, he may be lenient. Even then, however, one should eat at least a small quantity of Matza and Maror with Charoset 
- One should have a Kezayit of Matzah and of Maror for Korech. 
- One shouldn’t mix anything into the Korech besides the matza, maror, and charoset. 
How to combine them
- Some say that the Maror should be placed on top of the Matzah, some say to wrap the Matzah in Maror, while some say to place the Maror between the Matzot.  All of these methods are valid. 
How to Eat?
- One should not make a interruption that is unrelated to the Mitzvot from the time that he makes the Brachot on Matzah and Maror until eating the Korech.  After the fact if one made an interruption one still doesn’t make a Bracha on Korech . 
- One should eat the Korech while leaning.  If one didn’t lean and it’s difficult to repeat it one doesn’t have to. 
What to Say
- Sephardim should say the words “Zecher LeMikdash KeHillel."  Ashkenazim should say זֵכֶר לְמִקְדָּשׁ כְּהִלֵּל. כֵּן עָשָׂה הִלֵּל בִּזְמַן שבֵּית הַמִּקְדָּשׁ הָיָה קַיָים: הָיָה כּוֹרֵךְ מַצָּה וּמָרוֹר וְאוֹכֵל בְּיַחַד 
- S”A 475:1, Mishna Brurah 475:17, Dailyhalacha by Rabbi Eli Mansour.
- Source: The Gemara in Pesachim 115a records a dispute about how the Mitzvot of Matzah and Maror were fulfilled in the times that the temple stood. Chachamim say each thing was eaten on its own. Hillel held that you should wrap them up together into a sandwich to fulfill the Pasuk in Bamidbar 9:11 ,עַל-מַצּוֹת וּמְרֹרִים, יֹאכְלֻהוּ. Rambam Hilchot Chametz U'Matzah 8:7-8 brings this down. According to Rashi and Rashbam Pesachim 115a this sandwich included the korban Pesach. The gemara concludes that since there is no ruling on who we should hold like, the practice is to recite the bracha on matza and eat the matza, recite the beracha on maror and eat the maror, and then eat them together without a beracha, as a zecher lamikdash kihillel. Shulchan Aruch 475:1 codifies this. Mishna Brurah 475:16-18
- Shaking off Charoset: Shulchan Aruch mentions shaking off the Charoset with Maror but doesn't mention it with korech and this is the opinion that he quotes in Beit Yosef 475 "Vichen Katav" in the name of the Maharil. Mishna Brurah 475:17 quotes the Maamar Mordechai that one should shake it off. Kaf Hachayim 475:32 says if you want to eat the Korech without shaking it off that you can. Yalkut Yosef Moadim pg. 405 agrees, as does Dailyhalacha by Rabbi Eli Mansour.
- Rama 475:1. Tur 475 quotes the Raavya 525 that we shouldn't dip the Korech in the Charoset because we already fulfill the obligation to dip when we eat Maror, and the Charoset which is optional nullifies the obligation to fulfill Matzah and Maror according to Hillel (This logic is also brought by Rabbeinu Yonah (seder pesach pg. 274). He adds that dipping here would be adding to the two dippings that we mention is Ma Nishtana. There is also no danger from the Maror because the Matzah nullifies the bitterness. Tur 475 quotes the Rosh Pesachim 10:27 that we should dip, and this is the opinion of the Or Zarua 2:256, and Haghot Maimoniyot Hilchot Chametz u'Matzah 8:7 as well. Mishna Brurah 475:19 writes that most Achronim hold like S”A, but those who have the Minhag should continue the Minhag. Chazon Ovadia 1: pg. 736 rejects the objections quoted in the Tur and concludes that we should dip in Charoset.
- Chazon Ovadia – Laws of Pesach, pg. 101, Seder Hearuch pg. 528, Dailyhalacha by Rabbi Eli Mansour.
- Mishna Brurah 475:16, Kaf Hachayim 475:30, Dailyhalacha by Rabbi Eli Mansour, Sh”t Chazon Ovadia 1:42 all write that one should eat a kezayit of matza and a kezayit of maror in the korech. Shaagat Aryeh 100 says that according to the Rosh who says that you should only eat a Kezayit when you say a Bracha, then there would be no need for a Kezayit here. He concludes himself though that one should eat a Kezayit.
- Yalkut Yosef Moadim pg. 406, Dailyhalacha by Rabbi Eli Mansour
- Moadim U'Zmanim Haggada page 107 because the Gemara says he wraps the Matzah and Maror, not that he wraps one in the other.
- Rabbeinu Chananel Pesachim 115a, Sefer Hachinuch mitzva 21
- Aruch Hashulchan 475:7, Kitzur Shulchan Aruch 119:7.
- Haggadat Moadim U'Zmanim page 107, Kitzur S”A 119:7, Aruch Hashulchan 475:7, Seder Hearuch pg. 527. see Haggadat Moadim Uzmanim pg. 107 for other opinions. The Mishnat Yaakov 475 explains that the reason the custom changed from wrapping the Matzah in Maror to putting the Maror between the Matzot is that people started to use horseradish for Maror instead of romaine lettuce.
- S”A 475:1, Yalkut Yosef Moadim pg. 405, Tur 475 quoting the Sefer Hamanhig Hilchot Pesach 84. see Brocha on Korech by Rav Zvi Sobolofsky, where he explains that the reason we don’t recite a beracha on korech in the first place is because we assume that the berachot for matza and maror separately cover it
- Mishna Brurah 475:24, Sh”t Chazon Ovadyah 1:41, Yalkut Yosef Moadim pg. 405
- S”A 475:1, , Ben Ish Chai Tzav:34, Kaf Hachaim 475:36, Mishna Brura 475:23, Chazon Ovadia Pesach 5763 pg. 100, Dailyhalacha by Rabbi Eli Mansour
- Sh”t Chazon Ovadyah 1:40, Kaf Hachaim 475:36, Mekor Chaim 475, S”A HaRav 475:20, Pri Chadash 475:1, Dailyhalacha by Rabbi Eli Mansour
- S”A 475:1, Chazon Ovadia Pesach 5763 pg. 100, Darchei Moshe 475:3 quoting the Maharil. Beiur Halacha 475:1 s.v. VeOmer asks on the source for this practice, and says that perhaps there’s no reason. He also wonders why this is not considered a break, which the Shulchan Aruch says one shouldn't have between the Hamotzi before the first Matzah eating and the Korech. He gives two potential answers to this. According to the first answer, really the Shulchan Aruch wasn't careful with the order he put it in, and one should really eat and then say it. The second answer is that we should change the language of the Shulchan Aruch and you're not really supposed to say it at all. He leaves both questions unresolved. However, Sh”t Yechave Daat 1:19 and Sh”t Chazon Ovadyah 1:41 writes that this is the proper practice. Seder Hearuch pg. 528 and Piskei Teshuvot 475:6 say that even ashkenazim have the minhag to say it against the MB. Rabbi Joseph B. Soloveitchik quoted in Harirei Kedem 2:93 explains that really Korech isn't part of the obligations of Matzah and Maror but is just an independent expression of remembering the temple and there would then be no problem of a break. He says though, that Rav Chaim Soloveitchik would not interrupt between Motzi Matzah and the Matzah of Afikoman in accordance with the ruling of the Shl"a. Rabbi Chaim Jachter says that Rav Soloveitchik would recite it after eating Korech.
- Mishna Brurah 475:21, Shulchan Aruch Harav 475:18.