14 votes

Where does the notion that the *entire* matza process must be done in under 18 minutes come from?

This does not include the time in the oven, but the notion that the entire process until the dough goes into the oven must be completed within 18 minutes is based on actual opinions on the books. I ...
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  • 46.9k
11 votes
Accepted

Brewing fresh coffee for Shabbos with a time clock

The Sefer Yerushas Pleita (Siman 16) brings from a sefer called Matta Yerushalayim that quotes in the name of the Chasam Sofer that it was common for people to set up a fire on Erev Shabbos in a way ...
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11 votes
Accepted

"Blias" in today's pots and pans

Rabbi Dov Lior of Kiryat Arba made a ruling "in principle" saying that modern stainless steel cookware does not absorb flavor at a halachiclly significant level. Apparently two Avrachim from the ...
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11 votes
Accepted

What is פנאד"ש?

I have found in the article (p. 8 of the PDF) of Eliezer Papo that it is מאכל ספרדי דומה לבורקס שלנו היום – כיסנים ממולאים בבשר או בגבינה.‏ a Sephardic food similar to our bourekas today – dumplings ...
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  • 7,025
9 votes

How do you prepare a ram's head for Rosh Hashana night

From my experience as a kosher Chef. This is quite an endeavour but not impossible. One lambs head will not provide much meat but enough for all to taste. Here is one with usage of Moroccan spices/ ...
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8 votes
Accepted

Food cooked on Shabbas for Pikuach Nefesh

Short answer: If a Jew cooked the food, then yes, it may be eaten. If a non-Jew cooked the food it's a debate amongst the Poskim. Sources: The Kitzur Shulchan in 92:9 סימן צב - דין חולה שיש בו ...
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7 votes
Accepted

Ben Drosai - what was his Zechus?

The Yerushalmi in question is in Avodah Zarah 4:4. Prof. Shamma Friedman has written about the historical Ben D'rsai (who based on the Yerushalmi was not a Jew). According to this article, Rashi ...
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  • 236
7 votes

Brewing fresh coffee for Shabbos with a time clock

In Rabbi Eider's Halachos of Shabbos page 322 footnote 657, he quotes a list of Rabbis who say this is assur. In order of his quoting them: Rav Y. Henkin in Euros Yisroel page 122. Tzitz Eliezer ...
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  • 32.3k
7 votes
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Cooking nat-bar-nat food in an opposite-type pot

The Mishbetzot Zahav,1 in comment 4 to YD 95 , says (in disagreement with other authorities) that it is forbidden, ab initio, to cook pareve food in a meat pot with the intention of later re-heating ...
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  • 46.9k
7 votes

How was kosher cheese made before artificial rennet?

Very good question with a simple answer. It used to be made from rennet obtained from the cow's 4th stomach. I recall that almost all Miller's and Migdal cheeses were made this way. As to why this is ...
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  • 69k
7 votes
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How to reconcile a wife's cooking with the Zohar's definition of husband and wife?

Yevamos 63a: אשכחיה רבי יוסי לאליהו א"ל כתיב אעשה לו עזר במה אשה עוזרתו לאדם א"ל אדם מביא חיטין חיטין כוסס פשתן פשתן לובש לא נמצאת מאירה עיניו ומעמידתו על רגליו Rebbi Yosi found Eliyahu. He ...
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6 votes

Bishul Yisroel requirements following the food item rather than its preparation

In Igros Moshe yoreh deah 4 siman 48 ois 5 he says potato chips should be bishul yisroel, because it is not so clear that they don't need to be. He also adds that "it is like many foods made in ...
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  • 32.3k
6 votes
Accepted

Sous-vide cooking for Shabbat

In a shiur you can listen to here Rabbi Aryeh Lebowitz discussed some of the issues involved with sous vide which is begun before shabbos. They are: Shehiyah. Leaving foods on a heat source. Garuf ...
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  • 32.3k
6 votes
Accepted

Is a dud shemesh allowed to be used on Shabbat?

All sources are from Yeshiva.org.il's detailed article about this. Note that i am relying on them being correct -- i did not check them. As we said in the question, there are two possible issues: ...
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  • 22.8k
6 votes

What is liquid (prohibited from reheating on Shabbat)?

I asked this exact question to Rabbi Shlomo Mordechai Breslauer, rav of Bais Tefilo in Monsey, NY. He told me to put the substance on a surface that is not slippery (e.g. a paper plate), and hold it ...
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  • 6,434
5 votes

What are some general halachot about treif culinary schools?

[I thought about that question as it became even more relevant with the advent of cooking TV shows where a Jew might be involved in cooking non-kosher foods with no intent to eat it or serve it to ...
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  • 43.7k
5 votes

Grill used for neveilot

The Shulchan Arukh rules (OC 451:4) that a vessels used on a fire like a skewer or grill need to be heated up until sparks come off of them in order to kasher them. My understanding is that this is ...
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  • 95.6k
5 votes
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How long does entire process of baking matzo take to be kosher?

The Gemara in Pesachim 46a (brought in the Rambam Laws of Chametz 5:13 and the Shulchan Arukh OC 459:2) says that if one leaves dough for the length of time that it takes to walk 1 "mil" (a Talmudic ...
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  • 95.6k
5 votes

What rules need to be followed in order for a non-Jewish professional chef to cook Kosher food for a Jewish customer?

There are a few interesting points to address here. I am not going to go into a long discussion on all of the halachot of kashrut here because those can be found in depth around this site and ...
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  • 24.4k
5 votes

Is artificial sweetener (Splenda, Stevia) pre-cooked? (Making Coffee on Shabbat)

Partial answer: OU rules that Splenda is pre-cooked. However it recommends using a kli sheni, not a kli rishon.
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  • 69k
5 votes

Gas Pilot on Yom Tov

Google is your friend! The COR, Chabad, the OU, and the Star-K say you can light a burner from a pilot light on yom tov.
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  • 73.2k
5 votes
Accepted

Explain why the "kli sheini" rule works regarding Shabbat cooking

No need to worry about this being a bad question. Its Tosfos's question! ושמע מינה כלי שני אינו מבשל - תימה מאי שנא כלי שני מכלי ראשון דאי יד סולדת אפי' כלי שני נמי ואי אין יד סולדת אפילו כלי ראשון ...
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  • 5,295
5 votes

Tradition soup on shabbos

This exact type of instant noodle soup is addressed by Rabbi Yoni Levin here Ultimately, there are two potential pitfalls that making such soup on Shabbos would present: Bishul - cooking Makeh B'...
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  • 20.6k
4 votes

Coffee Urns on Shabbos

Rav Yechiel Perr told me that that after speaking to scientists he concluded that to use such an urn is not a problem as the water in the tube has already exchanged from the water inside. The sefer ...
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4 votes

cooking for shabbat in a campfire

You need to be aware of the halochos of hatmono (=insulating food), see below extracted from dinonline. I suggest you read the whole article and then CYLOR. There are two ways of insulating food: ...
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4 votes

Why can't we have challah in the oven with other food?

According to the OUKosher.org website if the Challa is completely wrapped up one may bake other items in the same oven. This is based on Shach (Yoreh Deah 108:1) who quotes from the Issur V’heter that ...
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4 votes
Accepted

Leftovers and Chillul Shabbat

If you have made a neder to use this particular food only on shabbat, then you would have to keep the neder. However, if you have set it aside for shabbat, then you have only determined that you will ...
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4 votes
Accepted

May one marinate fish on Shabbat?

The Mishna Berura in 321:5 (21) states that one may not salt raw fish or meat; whether to eat it on that Shabbat or to prevent it from spoiling. He says that it's a Rabbinic decree as it looks like ...
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4 votes
Accepted

If one accidentally reheats some soup on Shabbos, are they allowed to eat it?

There is a machlokes as to whether you can purposely do this or not. Most poskim say you can't but R' Ovadya Yosef allows it. See here While one mustn’t place a davar lach, a boiled food with liquid ...
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