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

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Earliest sources for hagalah

What is the earliest source explaining how to do hagalah? What is the earliest place we see detailed instructions for the hot rock method as opposed to the clay/dough method?
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Would a mermaid be kosher?

Tonight at religious school we were discussing Kosher laws and how to build/keep a kosher kitchen. While we were discussing different meats, one of the jokers in school asked if you could eat a ...
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*Asher Bamayim* (אשר במים) in kashrus halacha

To find the kashrus status of an organism, we first need to correctly classify it as plant, animal, bird, or asher bamayim*, as each group has its own distinct requirements. E.g., animals need to chew ...
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Does halakhah forbid Jews from eating pets that die naturally?

Suppose you keep a goldfish in your house. One day, it dies. Assuming that it has died a natural death (that is, you didn't intentionally kill it), is it kosher to eat this goldfish?
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Using a non-kosher rotating pizza oven

A countertop rotating pizza oven has a turntable on which pizza is placed. It has two heating elements: one heats from below the turntable, like a hot plate. A heating element above broils a section ...
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Kashrut of Oven Mitts [duplicate]

Since kashrut often requires one to have separate sets of cooking utensils for dairy and meat, should one use separate dairy and meat oven mitts?
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Is snow Kosher? Icicles?

The recent snow storm got me thinking about this. So are you allowed to eat snow? What about icicles?
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Is human placenta kosher?

There is, apparently, something called placenta encapsulation which means making pills out of a placenta postpartum for the purpose of digesting placenta. People claim that these pills offer unique ...
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Does soy milk need a hechshir

Does soy milk need a hechshir since they put in artificial things that can be trayf or its all natural and it won't need a hechshir
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The Torah's list of animals with one kosher sign

I have a question that has been troubling me for many years and I have never received a satisfactory response. On March 22, 2005 THE NY Times had an article entitled Religion and Natural History ...
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Creating a crowd-sourced database of non-dairy OU-D products

Several questions/answers on this site have pointed out that the OU-D hechsher does not always mean that the product is actually dairy. (But that it is, in reality, "OU-DE" [dairy equipment]. See here ...
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In vitro meat — further questions

Related to this question: Does artificial meat grown in a petri dish have the halachic status of meat? Assuming that in vitro meat becomes widespread and assuming that it would be hechshered per the ...
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Eating at Home and Maarit Ayin

Short question: is maarit ayin (מראית עין) a problem when one is home alone? Long question: assuming that in-vitro meat is pareve, even if it is maarit ayin to eat it with milk in public, would it be ...
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Milk-free cheese: Is it kosher? Parve?

So according to this article, scientists have created cheese by inserting DNA blueprints into a yeast. Essentially, the milk proteins are being created outside of any animal, through genetic ...
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Proper course for one realizing he is eating something forbidden [duplicate]

Suppose one was eating a piece of chicken, and he finds out it was from a non slaughtered chicken. Does Halacha require him to try to throw up?
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What defines “hard cheese” [duplicate]

I grew up with the minhag that after "hard cheese", one must wait for 15 minutes before one may eat meat. However, the question often arises as to what qualifies as such in terms of halacha and ...
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How to increase the demand for kosher food?

I live in the Hartford Connecticut area and while the population of people who practice the Jewish faith is increasing, the ability to find Kosher food is on the decline. Even the local Kosher grocery ...
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Does jam have the halacha of duchka d'sakina?

The Chochmas Adom in 49:9 holds that all fruit have the halacha of duchka d'sakina, and that if you cut a fruit with a meat knife which was not definitively clean, you need to scrape off the outer ...
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Does electronic cigarette juice require a hechsher?

Does electronic cigarette "juice" need to be kosher (require a hechsher)? Does it matter what flavor the juice is?
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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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Does an ivory spoon make hot tea non-kosher?

Both the handles of cutlery and entire spoons 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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How was kosher cheese made before artificial rennet?

I understood that cheese is made by throwing in Stomach hide into milk and letting it congeal. How was kosher cheese made (where one's not allowed to mix milk and meat)? Now we use chemicals or ...
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Eating in a non-kosher household [duplicate]

I am a converted Jew (mother is not Jewish, father is) who has recently began keeping Kosher. My mother is an excellent cook, and I greatly enjoyed eating what she made growing up. I still would like ...
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Who or what is OV? (kosher symbol)

In the store earlier, I saw a kosher symbol I had never seen before, and was wondering if anyone here knows what organization it represents. Here is the symbol: [ What is odd is that it looks like ...
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How big can insects be before falling into kashrut halacha?

So we typically clean vegetable matter of bugs because, while it isn't an aveirah to eat a bug part if it's smaller than a(n) (halachic) olive, it is still prohibited to eat any non-kosher living ...
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What can you look for to ensure that a vegan restaurant is Kosher? [duplicate]

Vegan restaurants claim to serve strictly vegetable and plant-based meals. They would seem to be automatically Kosher, but I've read and heard that there could be other Kosher issues. What are ...
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Whatever happened to plumbas?

Not so many years ago, a plumba (apparently created by Rabbi Jacob Joseph) -- a metal tag attached to the wing of a kosher chicken indicating that it was, indeed, kosher -- on a kosher chicken was the ...
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Wait 6 hours after milk?

I once came across someone who was avoiding the meat at a lunchtime simcha. When I asked him why, he said it was because he had eaten "cereal with milk" at breakfast. When I expressed confusion, ...
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Can I use the Flavia coffee machine in my workplace?

There is a coffee machine (also makes tea and hot chocolate) in my workplace that uses individual packets (not pods) for the drinks. I do not know what the mechanism is for turning that into a drink ...
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plastic utensil absorption and kashering

Does a plastic utensil swallow up taste and excrete it out like metal,or is it like glass. Also can plastic be kashered if it became treif? What are the sources that discuss this?
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Kosher status of medicine that comes in a gel capsule

What are the kashruth issues involved in the taking of gel-capsule medicine which does not have kosher certification?
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Are you allowed to take pills with gelatin [duplicate]

According to Halacha, are you allowed to take pills that are covered with gelatin? It's an antibiotic for acne.
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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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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 the majority of organic and/or free range eggs contain blood spots, why are they certified kosher? [closed]

Variables that are known of the organic and/or free range: I don't believe the eggs with blood are just protein spots even though brown eggs through observation usually do contain more protein spots ...
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Homebrewer then converts; are there leniencies that allow him to drink the beer he made?

Suppose a gentile is a homebrewer who later converts to Judaism. Fermentation and aging can be long-running processes, so even if he knew to anticipate the problem and ceased homebrewing activities ...
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The Sciatic Nerve and Fat of Kosher Fowl

I have learned that the sciatic nerve must be removed from land animals to render the meat kosher. But what about fowl? Does the sciatic nerve need to be removed from chicken or turkey? Why or why ...
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Does flavored dental floss need a hechsher?

You can find flavored dental floss these days usually in the flavor of mint. Is there anything to worry about or is it no worse than mint mouthwash? If not, doesn't the gemarah in berachot 6th perek ...
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The opinion that microwaves don't need to be kashered

So I remember hearing this opinion that followed like this: "Microwaves do not need to be kashered because the means of cooking in a microwave are different than those spoken about in the Gemara." ...
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What defines a “בהמה” (also “חיה”)?

As discussed in *Dag* (דָג) in kashrus halacha, *Tzomeach* (צוֹמֵחַ) in kashrus halacha, and *Of* (עוֹף) in kashrus halacha, there are different rules used to determine the kashrus status of ...
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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 it acceptable under kashrut to eat tyrannosauridae meat?

Theoretically speaking, if tyrannosaurs were still present these days, or in some way or another brought back, would they be kosher? Let's assume that they are properly slaughtered and prepared.
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Are mouse-deer kosher?

Mouse-deer do chew cud (they has four stomachs), but have not two, but four hoofed toes. Are they kosher?
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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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Buying non-Kosher food for home Emergency Kits

The United States federal government, American Red Cross, and surely countless other governments and NGOs recommend that families have Emergency Survival Kits in their homes in case of a natural or ...
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*Tzomeach* (צוֹמֵחַ) in kashrus halacha

To find the kashrus status of an organism, we first need to correctly classify it as tzomeach, animal, bird, or fish, as each group has its own distinct requirements. E.g., animals need to chew cud ...
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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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To what grains do the laws of yoshon apply?

For which species must we wait until after pesach to eat the previous crop? Are there different cut-off dates for different species?
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How do you look into a Pesach program?

I often hear that Passover programs are fraught with potential issues, primarily in the area of kashrus, but also with the reliability of the Rabbanim there and other issues. How can one go about ...
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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, ...