Rabbi Aryeh Lebowitz

So it certainly makes sense to have Eliyahu Hanavi involved in some way at the Seder.

But no need to, it's always fun to trick the kids, but there's no need to trick the kids and make them feel like that's a critical part of the seder.

In fact, the opening of the door for Shavuot Hamascha very likely has nothing to do with Eliyahu Hanavi.

It has to do with something, there's something to that minhag, that minhag is centuries old, but that minhag is recorded in the Ramah, so that's a good minhag, it's an important minhag, but very likely has nothing to do with Eliyahu Hanavi.

Again, I'm open for more suggestions of interesting things that people get wrong at the seder.

That's three stamina laches here.

I saw on the 10 minute halacha that someone wanted to know about two kizesim of matzah.

What's the inion of having two kizesim of matzah in the night of Seder?

After all, the mitzvah is achila, achilas matzah, and achila is always defined in halacha as a kizai.

So where does it come from to have two kizesim of matzah?

So what's interesting is it does not come from the Gemara.

The Gemara never says anywhere.

that one should eat two kazesim of matzah on the night of the seder, yet the Shulchan Aruch mentions it in Tafayin Hey Seif Aleph, because this is quoted by Rishonim, the Russian, tells us that Rishonim quotes this idea of two kazesim.

So what's the reason for it?

Shulchan Aruch writes,

You have a kazayis from a complete matzah and a kazayis from the prusa, from the broken matzah.

And if you're not able to eat for two gazesim together, you should eat the hamotsi one first and then the achillus matzah one, meaning the full matzah, the whole matzah first.

And then from the broken piece.

So Mishapur explains why two kazesim.

Mishapur in Sivkan Tes writes, From the broken matzah, of course you have to have a kazayis, because that's the al-akhilas matzah.