Kashrut (also kashruth or kashrus, כשרות or כַּשְׁרוּת) is the set of Jewish dietary laws.

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can frozen yogurt be OK without storefront certification?

It's increasingly common for frozen yogurt chains to have their central production plants be certified kosher. Examples include Pinkberry, Red Mango, and Yogurtland. When this is the case, are there ...
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235 views

How can I avoid Bishul Akum with a rice-cooker?

ASSUMING: I have a rice cooker here that's absolutely, certainly, never used for anything other than plain rice. The rice contains no flavorings, bugs, or anything else non-kosher. Rice is raw ...
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175 views

How could boiling 3 eggs at a time help?

A lot of people have a custom of boiling 3 eggs at a time, as mentioned here, among any other places. One reason given for this practice is that if one egg turns out to be unkosher, the remaining two ...
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224 views

How far does Chaticha Naaseh Neveila go?

Someone cooked an article of food in his kitchen in 2000. In 2010, he discovered that it was treif Gamur. Between 2000 and 2010 he changed all his cutlary, plates, etc. so that nothing that he owns is ...
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331 views

Hot water tap at work

Many offices have a water dispenser (with hot water spout) or a hot water tap next to a sink. Is this hot tap Kosher? Assume for a moment that someone uses the tap to dispense hot water into a cup of ...
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Transfer of taste to/from non-food items

There are a number of heating pads on the market for heat therapy cures and general warmth in the winter. Some are electric, but some of them need to be heated in a microwave or an oven. If you heat ...
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How long can יוצא ונכנס be?

In regards to kosher supervision, what is the largest single gap that a mashgiach can leave the premise and still be considered practicing יוצא ונכנס?
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Pouring honey into a hot beverage

Can pouring honey into a hot beverage, such as tea, create a Kashruth concern? In particular, if you pour honey into hot tea with milk, can you later use the same bottle of honey to add honey to a ...
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106 views

Opened “please-take!” food items in a non-Jewish workplace

Is it alright to consume unsupervised food items at work that are open and available to anyone, assuming the items were initially known to be Kosher1 and there's no evidence of tampering? Items that ...
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164 views

What makes something chametz?

Can I a recipe that uses flour but not water? As kids, we all learned that if the water and the flour touch for more than 18 minutes, then the matzo is chametz. When 20 ingredients are combined, ...
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386 views

Using a non-kosher toaster oven

What is the permissible way to use a non-kosher toaster oven? My thought process was that, when cooking milk in a meat oven, the covering of the dish and the rack makes it acceptable. Would covering ...
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266 views

What was the first product to receive Kosher certification?

What was the first product to receive Kosher certification?
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Why keep Kashrut?

Is there a known reason for keeping kashrut or is it a set of guidelines proposed by sages who we respect and don't question the logic behind? Is there anything in the Torah that suggests kashrut?
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food containers - why is hechser needed? [duplicate]

I want to buy a vacuum sealer for food. The vacuum bags do not have a hechsher. Normally, I buy ziplock bags that are OU. To keep this general, I am hoping someone can elaborate on the reason and ...
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113 views

Is it kosher to eat live fish

In some countries people like to eat animals that are still alive (e.g. dancing squid / octopus). Clearly these animals are not kosher, but it is also possible to eat kosher-types fish that are either ...
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449 views

How can you get hot kosher food on campus?

So you're living in a college/university town with no kosher restaurants. How can you get hot kosher food?
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342 views

Are there any national brands of tuna that are Bishul Yisroel?

Are there any national brands of tuna in the USA that are Bishul Yisroel?
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240 views

How is it possible for a pot of meat to become pareve? [closed]

I was recently posed the following puzzle: You have a pot of meat. You put in milk. It becomes pareve. How can this be? Any ideas on how this is possible?
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Is Rabbi Barnett Hasden's “Ner Tamid K” hechsher recommended?

Does anyone here know anything about the reliability of "Rabbi Barnett Hasden of Ner Tamid K in Staten Island, NY"?
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Does extra virgin organic coconut oil have to have a hechsher?

I am specifically referring to Coconut Oil. I know that my question is similar to this one: Is Extra virgin olive oil kosher by default? but My question is also about non-olive oils. Due to the huge ...
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239 views

I am or was a religious jew and purposely ate non kosher

I'm a religious Jew. I kind of lost faith and ate non-kosher purposely, and now I feel so bad with myself that I want to die. What should I do? Is there any type of repentance I should take upon ...
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Artificial non Kosher food

According to Vayikra we have: ז וְאֶת-הַחֲזִיר כִּי-מַפְרִיס פַּרְסָה הוּא, וְשֹׁסַע שֶׁסַע פַּרְסָה, וְהוּא, גֵּרָה לֹא-יִגָּר; טָמֵא הוּא, לָכֶם.‏ 7 And the swine, because he parteth ...
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Fins and Scales

I once heard that if a fish has fins it's enough - and you don't need to find out if it had scales. Is this true? What is the source? Why did the Torah write fins and scales, if fins is enough of an ...
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Hechserim on Matzos [closed]

There are matzos with circle U (O.U.) and matzos with circle K (O.K.). We want to keep high standards. Please tell us do these hechsherim have high standards? Does one of them have Higher standards? ...
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123 views

Easiest way to determine if something is “Chametz” or permitted for Passover?

A friend of mine runs a catering company that does do business with a sizable group of Jewish people. Around this time of year she gets requests to be 100% Passover Kosher of course. This often ...
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Seared Sushi Bishul Yisroel

Certain Sushi require the searing of the fish on the outside. Does this process require a Jew light the torch used to do the searing or is it not required? I have seen that some stores do and some do ...
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Reliability of the OKS

I dont know if this type of question is allowed but I was told to ask it here The symbol is on some restaurants in the NY tri-state area (like Crumbs Bake Shop for example) and I have heard of quite ...
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212 views

Is there a higher standard of kashrut for chicken analogous to “chalak beit yosef” for beef?

If I understand correctly, if someone wants to keep an extra-super-high standard of kashrut for themselves, s/he can look for "chalak beit yosef" beef, which means ("super-glatt") the lungs had ...
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Would silverware intended for one-time kosher use (e.g. airlines) need to be immersed in a mikva?

According to the Star-K, First Class and Business Class meals are double wrapped in real chinaware and sealed with kosher certification tape. They are then sent to the airline food service ...
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452 views

Children's Motrin and Advil

Recently it was publicized that certain lots of Children's Tylenol contain a non-kosher form of glycerin, and therefore should not be used in non-urgent situations. Does anyone have information about ...
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176 views

“Blias” in today's pots and pans

Throughout all of Yoreh Deah Chelek Alef and Hilchos Pesach (and perhaps other places in Shulchan Aruch as well) we see the idea of "blias" ("absorptions") by celim. That is to say there is a "taste" ...
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Shechting non-Kosher animals

The question was asked: If someone for example is sick and must eat from a non-kosher animal. Must it be shechted (slaughtered) first like a kosher animal? I don't see any reason why it should, since ...
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Is whisky matured in a sherry cask Kosher?

Is whisky matured in a sherry cask Kosher? I know there is a Machlokes about this. Who holds what?
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Bishul Akum for Sefardim

There is a difference of opinion among sefardi and ashkenazi poskim regarding bishul akum. For ashkenazim it is enough if a Jew lights the oven and a non-Jew cooks the meat. For sefardim, a Jew must ...
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Problems with the kashrut of todays machine matzot

I read a disturbing article by Rav Menahem Eizenberg in Techumin (26, page 123). The one of the many issues raised in the article is that the hechser for machine mazah does not apply to today's ...
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427 views

What forbids eating in a Jewish-owned restaurant open on shabbat?

Many restaurants in Israel, when asked about their kashrut status, reply that they are open on Shabbat. Thus, no hechsher. This also exists in establishments that would have a relatively easy time ...
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128 views

Why do we use a tight heuristic for fish egg kashrut and not trust supervision?

I recently listened to this podcast from the OU Kashrut Division on the kashrut of Bowfin eggs in particular and of fish eggs in general, and I learned something interesting about the kashrut of fish ...
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80 views

Can something be kashered by putting it in a cold pot then bringing it to a boil?

Normally the way a spoon would be kashered (in most circumstances) is taking a pot of boiling water, then dropping the spoon in. Instead, could I put a spoon in a pot of cold water, then bring the ...
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Kashrus Explained

A close friend of mine asked me to fire this question at the mi.yodeya community so here goes: "I came across this rather interesting rendition of "kashrus Explained", not sure who authored it, but I ...
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161 views

Why would a product be “only for cooking and pureeing”?

A recent OU kashrut alert that I found on Kashrut.com says: Kirkland Nature's Three Berries: Rader Farms, Inc.: This product bears a Half-Moon K symbol and should be used only for cooking and ...
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174 views

Family Event at non-kosher resturant

One of my family members is having a family event at a non-kosher restaurant. I want to be there because it is a very important occasion and I don't want to insult my family. However, I know that in ...
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107 views

Jewish Person Selling Non-Kosher Product

At a local convenience store near my work, they stock all sorts of non-Kosher products. However at the cashier's desk is a guy obviously orthodox Jewish (Curls down from the side, Black Clothing ...
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Are there any brands of mustard powder (flour) that are kosher for Passover for Sephardim?

Prepared mustard (containing vinegar and the like) is certainly not kosher for Passover. According to Ashkenazic practice, the mustard plant itself is included in "kitniot" and prohibited on ...
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92 views

Can non-kosher meat be eaten with fish?

The prohibition of mixing meat with milk and of deriving benefit from their mixture concerns only kosher meat (Hullin 8:4 [113a]; Hilkhot Maakhalot Assurot 9:3; Yoreh De'ah 87:3; etc). As such, it may ...
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Kashrut of rennet for cheese & Difference between rennet and gelatin

I actually have 2 questions which are related. Traditionally, making cheese involves using rennet, a substance derived from animal stomach. If the rennet is derived from a non-Kosher animal, it is ...
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Do non-toxic, biodegradable kitchen/dish cleaners pose a Kashruth problem?

In certain instances, I've heard rabbis allow soaps and harsh cleaners to be used to make food and food-residue "Pagum" (ruined), which then removes any prohibition that might otherwise result when ...
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How does Kavush work?

The Halachic principle of Kavush states that leaving something in liquid for 24 hrs transfers taste, and therefore it alters the status of the thing with which it is exchanging tastes. However, ...
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Kashering cold dishes for Pesach

If a vessel only held cold food, never hot, but was washed in the dishwasher, does it need hagalah for pesach? Or nothing? Is your minhag not to use any year-round cookware for pesach, or do you ...
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314 views

Brands of KFP peanut butter in the US

Does anyone know which brands of peanut butter are Kosher for Passover in the US? Alternatively, I have heard that there is a list for Sepharadim of KFP products that contain Kitniyoth. Can someone ...
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149 views

Purple/Red Cabbage kashrut issues

Funny thing happened to me tonight. I was buying some falafel and noticed that they did not have any "purple cabbage" (a.k.a. red cabbage) as a side dish option. I asked if they had any in back, and ...