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

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Kosher symbols on non-food items

I just bought a box of 100 sandwich bags and on the box there is an (U) symbol. This is neither unique nor uncommon. Why do marks of hechsher appear on non-food products? Is there anyone in the world ...
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Is being vegan “kosher”?

Is being a vegan completely okay according to halacha? Even if a vegan is not eating anything traif (non-kosher), perhaps it's not truly correct because you are not following the commandments to ...
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At a non-kosher restaurant, is sliced raw fish kosher?

At a non-kosher restaurant, is thinly-sliced raw fish kosher? Let's assume one sees the preparer clean the knife and cut from the whole fish. Also, let's assume this raw fish is sashimi — ...
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Eating Giraffe Meat

Why is it common practice not to eat Giraffe Meat?
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kashrus of mouthwash, toothpaste, lip balm

What are the halachic and factual issues involved in, and various rabbis' holdings on, whether flavored mouthwash, flavored toothpaste, and flavored lip balm need to be kosher, or need a hechsher (...
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Difference between eiver min hachai for Jews and Noahides

Both Jews and Noahides are forbidden to eat aiver min hachai (a limb torn from a live animal). Is there any difference between the prohibitions for Jews and non-Jews?
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Eating your own (kosher) food in a non-kosher restaurant?

This was brought to mind by this question: What are the rules about joining your co-workers (or the like) for a meal in a non-kosher restaurant, but bringing your own food? Is it prohibited as mar'is ...
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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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Is kosher food cooked by an irreligious Jew Bishul Akum?

Assuming that one can ascertain that food cooked by an irreligious Jew is kosher, is the food still prohibited due to Bishul Akum? Does this also apply in a case of need, such as one visiting an ...
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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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Why is chicken “meat” (with regards to basar bechalav) and an egg not?

Why is chicken considered meat but fish is not? Also, why is an egg considered pareve? And if we can eat chicken eggs, why can't we eat caviar (fish eggs)?
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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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Zimun and Bentsching (Bircat Hamazon / Grace After Meals) with Jews who ate non-kosher food

I came across an interesting situation recently. I was eating with Jewish, non-observant friends. I brought over a hamburger from a local kosher take-out place. They had homemade, non-kosher food, ...
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Does kosher mean healthy?

What is the relation between kosher and healthiness? G-d wants us to eat properly but also to be healthy. For example, it is better to try not to eat too much meat (even if it's kosher), and more ...
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If a product with a Hechsher doesn't say dairy does that mean it's pareve?

I'm not sure when this practice started, but I noticed that many/most/all Kosher Certifications indicate whether a product is dairy or not. Does a lack of such a marking indicate that the product is ...
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Are there any hechshers that certify food as kosher for B'nei Noach?

Are there any hechshers that certify food as kosher for B'nei Noach? Or any restaurants that offer such food? If not, how do observant B'nei Noach ensure that the meat that they eat was definitely not ...
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*Of* (עוֹף) in kashrus halacha

To find the kashrus status of an organism, we first need to correctly classify it as plant, animal, of, or fish, as each group has its own distinct requirements. E.g., animals need to chew cud and ...
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Is autocannibalism halachically prohibited?

I was wondering if sucking your own blood or biting at your own scab or otherwise consuming yourself was halachically permissible, since, as far as I can tell, humans are not kosher. Even so, it would ...
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Where is the story of the medieval rabbi who ruled a fish was non-kosher because of his dream?

If I recall correctly there's some fish whose kosher status is questionable; a medieval rabbi (Rishon) ruled it was okay, then had a dream that night where all his students were sitting around and ...
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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 restaurants need a kosher certificate?

There is a concept of "Eid echad ne'eman b'issurin" which means if a person testifies on something that is questionable we believe him. An example would be regarding kosher: if I go to a friend's ...
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What is the actual temperature of Yad Soledes?

What is the actual temperature of Yad Soledes?
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How many degrees of separation from food does one have to kasher?

I understand that the sink, the dishwasher, and sponges, etc. all need to be kashered, presumably because they touch things (plates, utensils) that also touch food. But how many degrees of separate ...
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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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May a person order food from a vegan restaurant

May a person order food from a vegan restaurant? — assuming you aren't ordering cooked food, to avoid the problem of bishul akum. If your ordering let's say a salad, what could be the problem? ...
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Is a rare steak kosher?

If you have a steak medium to rare, such that it's still pink in the middle, is it kosher? At what point is meat cooked enough?
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Why assume coffee is kosher

Why can it be assumed that coffee from coffee shops is kosher? Why couldn't the equipment become unkosher through exposure to non kosher ingredients or when being cleaned? For example the Canadian ...
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How to respond to “but he does”

I mentioned to my coworker that I can't eat Domino's pizza, not even without meat, as it's not kosher. He pointed out in response that a fellow coworker of ours, whom I'll call Josh, and who is ...
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What Issues Exist with the Tablet K Hecksher?

The Tablet-K hechsher is quite common on products in US supermarkets - especially cheeses. There seems to be a strong sentiment that it is not an acceptable hechsher, but I've heard no halachik ...
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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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Invitation to nonkosher restaurant

The question "Keeping Kosher at a secular company" asks about food issues on the job in general. This question is focused more narrowly on "unbalanced" situations: situations where there's an ...
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Is swordfish Kosher?

What's the deal with swordfish? Is it Kosher? Which sources say yes, and which sources say no? EDIT: I know that R' Dr. Moshe D. Tendler is well known for having consulted with scientists (in 1951) ...
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Is there a “5 second rule” for foods becoming non-Kosher?

OK so I don't actually mean a 5 second rule. But is there an amount of time that it takes for something hot that comes in contact with a non-Kosher utensil or surface to become not kosher? For ...
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Halachic Considerations for Women in the IDF

For a religious girl going into the IDF very soon, there are a few questions that are often asked: Especially in active units, wearing a skirt while on base can be a problem: While crawling, ...
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How to identify Yashan

I would like to serve food to a friend who observes the restrictions against eating Chadash grain products, but I don't have access to a guide on identifying Yashan. However, I have heard, that ...
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Why do some people have a custom to boil only odd numbers of eggs?

I heard that some still have a custom to boil only odd numbers of eggs at a time. I heard that the reason is if there is a blood-spot in an egg, the egg will be Battel Berov. This only explains why ...
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Eating in less-religious homes

May one eat a meal in the home of one who attended yeshiva and who one considers trustworthy vis-a-vis making sure everything is kosher for their guests, however, one is reasonably certain they do not ...
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Is there a kashrus issue with paper towels?

Is there any concern about using paper towels with hot food? I know there are some who advise against using the first few and last few sheets during Pesach, due to the presence of starch-based glue ...
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1answer
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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 was kashrut affected by Science?

I have been reading a lot of questions concerning kosher foods, to get a better understanding of what it means for something to be kosher. To an atheist, this site is very helpful. But as a chemistry ...
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Can a hot water urn that is used throughout the year be used for Passover?

Can a hot water urn that is used throughout the year be used for Passover? If not, what is the reasoning why, if it is only used for water (i.e., not coffee). Would the same reasoning hold for a ...
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1answer
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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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3answers
595 views

Can Jews eat non-Kosher meat?

Is it permissible for a Jew to eat meat that isn't treif or forbidden flesh if it was not purchased from a kosher butchery? I was told by a Muslim friend of mine that non-halaal meat (except pork) isn'...
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2answers
643 views

Do I have to check my fruits and vegetables [for insects] before I put them in a smoothie?

I use both frozen and fresh fruits and vegetables in my smoothies, and mostly organic. Does the type of fruit or vegetable matter? For example, produce that generally has more insects, such as ...
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1answer
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What is the justification for not requiring “chalav Yisrael” cooking equipment for those who don't hold by R' Moshe's leniency?

As Shalom explained in his answer to a question about chalav Yisrael milk, R' Moshe Feinstein ruled that in countries where the local government regulations are sufficient to ensure that cow's milk is ...
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Making a bracha on kosher ingredients cooked in non-kosher pots?

Is it assur to make a bracha on foods whose ingredients are kosher but cooked in non-kosher utensils? What is the source?
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any point to avoiding meat and shellfish at non-kosher restaurants?

Some Jews have a practice of keeping kosher at home but eating at non-kosher restaurants, where they will be sure to avoid ordering meat or shellfish. Is there any "point" to this from a halachic ...
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In a bulk food store, must I ask to see the original label every time I return and buy my favorite food?

I know that where I live, some foods don't need kosher certification. But most do. Say I go to a reliable bulk food store, ask to see the original bucket that a certain food came in, see a reliable ...
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Does a pot that cooked food with a bug in it need to be kashered afterward?

If one were cooking a pot of pasta or a soup and later found a bug or many bugs in the pasta or soup, would the pot need to be re-kashered after it was thoroughly cleaned?
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Is the leviathan kosher?

The leviathan seems to be a unique sea creature, which I've always pictured as some sort of sea serpent. This is consistent with Yeshayahu 27:1's description of it as a snake (nachash). An answer to ...