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

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Are preservatives called a “davar ha'mamid”

At the end of YD Siman 87 we find the dinim of "mamid". Over there it's speaking about cheese made in the skin of the kevah of a nevilah of treifah. The Rema explains that because it is an issur for ...
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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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what is kosher meat?

I have heard different theories about Kosher foods, such as They sacrifice animal in a proper way They recite God's name when sacrificing the animal They only eat front limbs of animals. The rear ...
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Working in a non kosher yogurt store

I was asked a question this afternoon and I don't know a good answer (yet) so I'm posting it. I have been asked in the past whether a Jewish person may work in a non-Kosher restaurant that serves ...
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Is it permitted to lick the adhesive on an envelope?

While most stamps are now self-adhesive, most envelopes still require moistening the adhesive in order to seal it. Is it a kashrus problem to lick the envelope's adhesive?
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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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The stolen maple syrup and kashrus

Does anyone know if there is going to be a kashrus problem with maple syrup next year? A rather large amount of maple syrup was stolen last year. The thieves did not keep it in the original casks, ...
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Does Neveilah/Tereifah make you Fleishig?

Another question asks whether meat of a non-kosher species (Behemah Temeiah or Hayah Temeiah) makes one Fleishig (considered to have eaten meat, so cannot eat milk). My question then is about kosher ...
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What is “blood that moved from one place to another”?

I'm learning laws of salting in the Shulchan Aruch. One concept I'm battling to understand is "דם שפירש ממקום למקום" - blood that moved from one place to another. Here's a good example of my ...
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One-in-Sixty Versus Roiv- Why both?

There are two concepts in the Halacha of Bittul (nullification). One says that if there is an item that is Unkosher that falls into another item that is Kosher, and it is a mixture, and the Unkosher ...
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How does one keep a kosher sink?

How does one keep a sink kosher when using two separate sets of plates and dishes?
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Kashrus status of turkeys

From what I have heard there were those that did not eat turkey (such as Rabbi Yaakov Kamenetzky Zatzal) due to a question whether we have a Mesorah as to the Kashrus of this bird. I know that many ...
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229 views

Trustworthiness of “new” dishes

When one buys new dishes from a store (e.g. cutlery, plates, bowls), is there any concern that they are not as "new" as they are claimed to be? For example, someone buys some cutlery and plates, ...
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227 views

Status of plastic drip coffee filter cone

What would be the status of the coffee maker cone shown below if it were to be used to make a cup of coffee in a dairy mug? Would it become dairy? Would it remain parve? Here's how it works. It ...
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impure animals: present, future, past

The verses in Vayikra 11:4-6 gives 3 examples of different impure animals which don't have split hoofs, namely: the camel, the 'hyrax' (shafan) and the hare. An interesting thing I once noticed is ...
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Dried insects - permissible?

I just read the website of a Kashrut inspection agency with which I'm familiar, but only insofar as I have seen it many times and tried, but failed, to find any information about the agency's ...
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Why is Kosher important?

Why is Kosher important to Jewish people? It is not necessarily healthy food from what I can see.
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Kashrut: Meat and dairy

My family owns a farm that produces fresh food, including dairy and meat. Would the prohibition to eat milk and meat together still apply since I have ascertained that the cow from which milk was ...
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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) ...
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Does a Chalav Yisroel milk bottle help?

There are many stores out there (e.g. Coffee shops) that have a hechsher, but are Chalav Stam. To get around this issue, some of these stores offer the option to request Chalav Yisroel milk for those ...
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Food cooked by a non-Jew not kosher?

Why is it that food cooked totally by a non-Jew - without the participation of a Jew - is not kosher?
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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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Is human flesh a kosher food?

Is human flesh a kosher food? Please provide both modern and classical sources.
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How can pigs and shellfish be kosher for bnei Noach?

As a ben Noach, I watch what meat I eat. I eat kosher or halal cut meat only. However, I think that bnei Noach aren't forbidden from eating pig meat or shellfish. How would I make sure that such meat ...
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Is Ever Min HaHai a Nevelah?

Does Ever Min HaHai have a Din of Nevelah? Does it render food cooked with it Nevelah? If it's meat from a Behemah Tehorah would it be Asur to cook with milk?
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Synthetic unkosher meat?

Suppose tissue identical to that of a pig could be created synthetically (with kosher ingredients) in a science lab. The meat would be completely indistinguishable from pig meat, but it would never ...
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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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Non-kosher, non-Jewish-run, Sushi Restaurants

Is the food served at a non-kosher, non-Jewish run sushi restaurant considered non-kosher because of the non-kosher-ness of the knives, the bishul akum of the rice, or both?
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Fresh fish need hechsher

Does fresh fish from a supermarket or fish market require a hechsher? I would be tempted to believe that a fish known to be of a kosher variety would not need certification since there is no shechita ...
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Does it make logical sense to “not hold by OU kashrus”?

Apparently there are some people who do not rely on the OU for kashrus. I have seen a few online references (i.e. this Matzav post) that claim this makes no logical sense, since virtually every other ...
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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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Kosher status of medicine that comes in a gel capsule

What are the kashruth issues involved in the taking of non-prescription gel-capsule medicine which does not have kosher certification?
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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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Dirt and Kashruth

Does dirt (an unknown foreign object that makes the food look bad) have a status of non-Kosher, such that if it were put in a pot and boiled or run through the dishwasher, it would make other things ...
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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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Which rabbis permit food being kosher just based on the ingredients?

Kosherstarbucks.com give options of what to order based on different halakhic standards. They include the "No Utensils List" (CRC-recommended), the Regular list, and the Kosher by Ingredients list ...
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Dead Fly on Hot Oily Pan [duplicate]

Possible Duplicate: Does a pot that cooked food with a bug in it need to be kashered afterward? Fly lands on hot oily pan and duly dies. Kashrut implications? (Of the pan, not the fly :p )
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Bentching after accidentally eating prohibited foods

Should one recite Birkath HaMazon after eating foods that one did not realize were prohibited, or does this fall under the idea that doing so is offensive?
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Making a Berachah on rabbinically prohibited foods

Should one refrain from making a Berachah on rabbinically prohibited foods, or does that rule only apply to biblically prohibited foods?
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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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Efshar LeSoḥato Asur - because or even though?

I'm trying to comprehend the concept of "אפשר לסוחטו אסור" (roughly: "if it's possible to extract it - something prohibited from something otherwise permitted - it is prohibited"). As far as I can ...
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What makes something “worthy of being honored”?

When a piece of meat is in a mixture that should nullify it, we don't consider it nullified if it is ראוי להתכבד, or "worthy of being honored", something you would serve to a guest. Is there some kind ...
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fruit-flavored tobacco Kashrut

Do the fruit-flavored tobaccos that are widely used in hookahs require a Kashrut certification similar to foodstuffs? If yes, why; if not, why not?
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Does bagged lettuce need a hechsher?

Does one need a hechsher on commercially available bagged lettuce? Or is the standard washing process used by the producers sufficient to remove all insects of halachic significance? Anecdotally, ...
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Why aren't Yemenites an ed echad on locusts?

I've heard that the reason we (most of us) don't eat the locusts enumerated as kosher in the Torah is that we cannot identify them. That is, we don't know what type of locust is referred to by the ...
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Does an ivory spoon make hot tea non-kosher?

Both the handles of cutlery and spoons entire have been made of elephant ivory, which is from a tusk (a tooth) of an elephant. Elephant is of course not a kosher animal. Presumably, then, these spoons ...
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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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Non-Jews and kosher wine

As a non-Jew, undergoing the conversion process, I am very careful regarding the Torah, rabbinic, and cultural laws. However, some times it seems to me that some laws are not compatible for converts. ...
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What possible Kashrus concerns may exist with these vitamins?

Recently my child's Doctor prescribed vitamin drops for my infant son. When I went to the pharmacy to fill the prescription the pharmacist said that the vitamin drops prescribed are Treif, and the ...
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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 ...