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

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What is the source for requiring constant supervision in a meat restaurant?

Looking to help out Prof. David Bernstein, in this comment. I've heard that kashrut certification organizations require meat restaurants to have a mashgiach supervising operations at all times. What ...
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Are plants that exhibit rapid plant movement considered non-Kosher animals?

There is a question here asking if sea sponges are Kosher. The answers seem to center around the idea that regardless of if they have animal cells, a halachic classification might depend on how it ...
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Equipment used for cooking by a non-Jew

I've heard that even if kosher ingredients and equipment are used, the food cooked (i.e. using heat) by a Gentile isn't kosher in most circumstances. I am wondering what the opinions are regarding ...
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Is aged beef salted and soaked before or after the aging process?

Some kosher butchers are now offering aged beef. Is this meat salted and soaked before or after the aging process?
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Can Jews eat hunted animals?

Are Jews allowed to eat hunted animals? That means the animals are dead before getting their necks cut. I do not think that a large proportions of ancient Jews were hunters, but I would be surprised ...
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Would coffee in beer be kosher?

It is common practice to allow drinking coffee pretty much anywhere. It is also widely accepted to drink unflavored beers. Would that logic allow one to drink beer that is commercially brewed and/or ...
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What defines a non-kosher restaurant for purposes of maarit ayin?

There is a known halacha that one shouldn't eat in a non-kosher resteraunt due to Maaras Ayin, even though they serve kosher food also. What defines a non-Kosher restaurant? McDonald's is probably ...
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Are Dunkin' Donuts kosher without hechsher?

Can one (who is not strict about cholov Israel) eat Dunkin' Donuts without a kosher certificate?
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kosher food ideas without refrigeration

What kosher food should I pack for a one-week trip? I won't have access to a fridge; and no kosher food will be available at my destination. The only food idea I can think of is tuna. That would ...
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Reliance on non-Jews for removing bugs

In discussing washing salted meat according to Halachah, there is a lengthy discussion about whether and when we can rely on a non-Jew who claims to have done it. The Tur (Y"D 69:10) says that there ...
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Rambam held of Timtum halev?

There is a famous story of the Rambam in the name of R' Chaim Brisker: "When the Rambam visited Yemen, he met a certain gaon of the geonim of the time. And after the Rambam returned home, this ...
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Premixed Gatorade and Powerade aren't cheap. I'd rather buy something powdered or concentrated. What's kosher?

I'm sick today; I think it might be (mild) gastroenteritis. DuPont et al. write that "the most important form of therapy consists of fluid combined with electrolytes", citing the CDC. I'd rather use ...
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Fruits and Vegetables Prepared With Treif Utensils

Can I eat e.g. a watermelon cut with a treif (non-kosher) knife on a treif cutting board and stored in a treif container?
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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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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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Can one trust the Kashrut of Alcoholic Beverages in bars?

Kosher Organizations, like the CRC (Chicago Rabbinical Council, supply lists of alcohol recommended for purchase and consumption. May one purchase these alcoholic beverages from a bar (where the ...
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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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Finding Kosher Fruit Flavored Snacks

Anyone know of a kosher fruit flavored snack, similar to these? According to oukosher.org there exists a "Scooby-Doo! Fruit Flavored Snacks 10 Count Carton" that is OU Parve, but I cannot find it ...
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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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Are homeopathic remedies kosher?

I'm not sure what they put in the remedies but I would like to know if they are kosher and would batel beshishim apply in this case if there was a non-kosher ingredient?
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Confectioners glaze - non alcoholic

Recently I read an article by Rabbi Yirmiyohu Kaganoff regarding confectioners glaze. Confectioners glaze is manufactured from shellac, "a glandular secretion of the lac insect, Kerria lacca, a ...
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Maris Ayin and bags from restaurants

Similar to this question, suppose there is a chain of restaurants that is mostly non-Kosher, but there happens to be one kosher franchise in the chain. The example I am thinking of is that there is ...
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Throwing out food with “questionable” hechsher - bal tashchis?

If one receive cooked food from a person that perhaps used ingrediants from a hechsher that one normally wouldn't eat is it bal tashchis to throw out the food? With packaged, store-bought food it ...
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To what extent should one not sell unkosher goods?

I know that, as a Jew, I shouldn't sell unkosher goods. So, does this mean I can't directly make profit from selling unksher goods? For example, if I work for Walmart, and some one buys pork while I ...
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When is a grafted tree Kosher?

I understand that fruit isn't kosher if it is picked in the first 3 years of growth. However, what about grafting trees? If two branches come from trees that each more that 3 years old, but the ...
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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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Is Coca Cola (and other beverages) kosher everywhere in the world?

I'm currently sitting in an airport transit lounge in Istanbul, and thinking I wouldn't half mind a drink. Available to me are the usual range: Coke, Fanta, Sprite, filter coffee... Are these ...
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What are the reasons that chewing cud is a kosher sign?

In parashat Shemini (Lev. 11:3), we learn that one of the signs for distinguishing kosher mammals is that a species must chew its own cud. Are there any taamim (explanations) that elucidate the ...
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Is a Jewish farmer allowed to raise animals for non-kosher slaughter?

Is a Jewish farmer allowed to raise animals for non-kosher slaughter? Does it make a difference whether it is a non-kosher animal (e.g. pig), vs. a kosher animal? Does it make a difference whether the ...
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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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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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What foods do not need a Pesach hechsher?

Which foods are kosher for Pesach with only a "year-round" hechsher, or with no hechsher at all?
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Cities' רבנו‏יות's accepting others' food

Years ago, IIRC, I heard the following from a respectable source: By Israeli law, if the רבנות of one city certifies a food as kosher, then the רבנות of any other city must allow that food as an ...
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The Manna and non kosher taste

The Gemarah in Yoma 75a explains that the manna imparted all flavors except five flavors. Based on this idea, can one have in mind the taste of pork while eating the manna, or do we say that anything ...
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Is Guinness Beer no longer kosher?

A new Smithsonian article has discovered Guinness Beer's use of isinglass, a technique that Guinness Beer has confirmed that it does to the Huffington Post, and even declared "Guinness Black Lager is ...
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Can my non-Jewish co-worker bring me coffee from the corner cafe?

Assuming coffee is Kosher, would it be alright if my non-Jewish co-worker brings me coffee on a trip to the corner cafe? May I assume that the co-worker indeed purchased a Kosher item and has not ...
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Is Halal Meat Kosher?

Muslims slaughter a Cow by saying "Bismillah, Allahu Akbar" meaning : "In the name of Allah , Allah is Great"" and follow the Zabiha (shechita) procedure to make it Halal. Some salient point of the ...
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Does every thing need a hechsher?

Do objects used in food preparation and foods that have no or little chance of being not kosher really need a hechsher? Please cite sources, if you can.
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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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Why is kosher wine or grape juice rare alone but less so as an ingredient?

My understanding is that wine or grape juice is s'tam yenam and forbidden if handled by non-Jews without having been cooked. (See, e.g., an explanation on chabad.org.) The practical result of this, ...
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How to explain Kashruth simply?

How can one explain Kashruth to a curious colleague without too much complexity? I get curious questions all the time, mostly about the laws and about rabbis blessing the food, which is, of course, a ...
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“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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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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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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Waiting to reveal Kosher issue in order to get to the root of the problem

Suppose a Mashgiach realizes that a store is selling Treif meat, however is unsure as to the source of the problem. If he announces immediately that this store is selling something not Kosher he may ...
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Is Extra virgin olive oil kosher by default?

I was given extra virgin olive oil as a gift from Italy (picture below), and I wanted to see if that type of olive oil is treated like fruits and vegetables, or does it needs to have certification on ...
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Sharpening a knife as N"T [duplicate]

Is sharpening a knife a concern of Nothein Ta'am in Kashruth matters?
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Sharpening a knife as Ne'itzah/Kelipah

Can sharpening a knife be done as a form of Ne'itzah for removing a Kelipah for Kashruth concerns?
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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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Eating treif under hashgacha

What happens if someone eats at a restaurant with a kosher certification (hashgacha) but is served, and unknowingly eat non-kosher? What are the spiritual and halachic ramifications to all parties ...