What is Kosher? The Complete Guide to Jewish Dietary Laws

Here is something most people do not realize about the word "kosher" — it does not just apply to food. Kashrut can apply to what a person does, thinks, says, or eats. When we say something is "kosher," we mean it is fit, proper, the way it should be. A kosher business deal is an honest one. A kosher Torah scroll is one written perfectly, with no errors. But yes, most of the time when people ask me "what is kosher?", they are asking about food. So let me tell you about what goes on in my kitchen.

Kosher (Hebrew: כשר, meaning "fit" or "proper") refers to food that meets the dietary requirements of Jewish law (Torah and rabbinic tradition">halacha). These laws originate in the Torah and have been elaborated upon by rabbinical authorities over thousands of years.

Keeping kosher is one of the most recognizable aspects of Orthodox Jewish life. It affects every meal, every grocery trip, and every restaurant choice. But the laws go far deeper than most people realize — and living them day to day is just... life. It is not a burden. It is how I cook, how I shop, how I set my table.

The Basic Rules of Kosher

Animals: Which Ones Are Kosher?

Land animals must have split hooves AND chew their cud. This includes cows, sheep, goats, and deer. Pigs have split hooves but don't chew their cud — that is why pork is not kosher. Rabbits chew their cud but don't have split hooves — also not kosher. The Torah actually uses the pig as the classic example of something that looks kosher on the outside (it has the split hooves, after all) but is not on the inside. There is a life lesson in there.

Fish must have fins AND scales. Salmon, tuna, cod, and herring are kosher. Shellfish (shrimp, lobster, crab), catfish, and swordfish are not. When people find out I have never tasted shrimp, they look at me like I am missing out on something life-changing. I promise you, I am doing just fine.

Birds: The Torah lists specific non-kosher birds (mostly birds of prey). Chicken, turkey, duck, and goose are considered kosher by tradition.

Insects are generally not kosher (with a few exceptions for certain locusts, primarily relevant in Yemenite tradition). This is why we carefully check leafy vegetables like lettuce, broccoli, and strawberries for insect infestation. I will be honest with you — checking romaine lettuce is one of the more tedious parts of keeping kosher. You hold each leaf up to the light, you rinse, you look again. Some people use special thrip cloths or lightboxes. I have spent more time examining lettuce leaves than I care to admit. But it is what we do, and after a while it becomes second nature. My kids know that you do not just grab a strawberry and eat it — you check it first.

Meat and Dairy Separation

One of the most distinctive kosher laws is the complete separation of meat and dairy. This comes from the Torah's commandment: "Do not cook a kid in its mother's milk," which appears three times.

In practice, this means:

• You cannot eat meat and dairy in the same meal
• You must wait between eating meat and dairy (customs range from 1 to 6 hours, depending on community tradition — in my family, we wait six hours)
• Separate dishes, pots, utensils, and even sinks or dishwashers are used for meat and dairy
• A third category — "pareve" — includes foods that are neither meat nor dairy (fish, eggs, fruits, vegetables, grains) and can be eaten with either

Let me paint you a picture of what this actually looks like in a real kitchen. In my kitchen, I have two sinks — one for meat, one for dairy. I have two dishwashers. My meat dishes are one color, my dairy dishes are another. Meat utensils have a different handle color from dairy utensils. My pots and pans are stored in separate cabinets. When I cook a meat meal, everything that touches that food — the cutting board, the knife, the serving spoon — is from the meat side. After a meat meal, we wait six hours before having anything dairy.

It sounds complicated when I describe it, but honestly? It is just how my kitchen works. I set it up once, and now it runs on autopilot. Every Orthodox Jewish woman has her system, and she will defend it fiercely.

Shechita: Kosher Slaughter

For meat to be kosher, the animal must be slaughtered by a trained shochet (ritual slaughterer) using a perfectly sharp knife in a single, swift cut across the throat. This method is designed to cause the least possible suffering.

After slaughter, the meat is inspected for any signs of disease or defect. The blood must be removed through salting and soaking, as consuming blood is prohibited by the Torah. This is actually one of the reasons kosher meat has a distinctive taste — the salting process seasons it in a way that is unique.

Kosher Certification

In the modern food industry, processed foods require kosher certification. A mashgiach (kosher supervisor) oversees production to ensure all ingredients and processes meet kosher standards. You will see symbols on packaging — common ones include:

• OU (Orthodox Union) — the most widely recognized
• OK — another major certification
• Star-K, Kof-K, CRC — other respected agencies

A "D" next to the symbol means dairy. "P" means kosher for Passover. "Pareve" means neither meat nor dairy.

I will tell you, learning to speed-read kosher symbols on packaging is a skill every Orthodox Jewish woman develops. I can scan a label in about two seconds flat. My non-Jewish friends think it is a superpower.

The Kosher Kitchen in Real Life

People always ask me what I cook. The answer is: everything! Kosher cooking is not some limited, bland cuisine. Ask any Orthodox Jewish woman for her chicken soup recipe — go ahead, ask! — and you will get a passionate, detailed answer, because every family has The Recipe, and every family is convinced theirs is the best. My chicken soup has been known to cure colds, lift moods, and settle arguments. At least, that is what I tell myself.

The beauty of a kosher kitchen is that it forces you to be creative. You cannot throw cheese on your chicken, so you learn to season differently. You develop incredible pareve desserts that nobody believes are dairy-free. Friday in my kitchen smells like roasting chicken, fresh challah, and the beginning of something sacred.

Why Keep Kosher?

We keep kosher because the Torah commands it — that is the fundamental reason. But there are many deeper meanings that have been explored over thousands of years:

Spiritual discipline. Making conscious choices about what you eat trains you to be mindful in all areas of life. If you can say "no" to a perfectly delicious-looking cheeseburger, you can exercise self-control in other areas too. Kashrut teaches us that not everything that is technically edible is meant for us. That kind of discipline spills over into every part of life.

Sanctifying the mundane. Eating is a basic biological act. Kosher laws transform it into a spiritual practice. Every meal becomes an opportunity to connect with G-d. When I wash my hands and say a bracha before eating bread, I am turning a sandwich into something holy. That is remarkable, if you think about it.

Community identity. Sharing kosher meals strengthens bonds within the Jewish community. The kosher table is where families gather, guests are welcomed, and traditions are passed down. Some of my deepest friendships have been built over Shabbat meals in each other's homes.

Health considerations. While this is not the primary reason, many kosher laws do have health benefits — proper slaughter, blood removal, and avoiding certain animals have practical advantages. But I want to be clear: we keep kosher because Hashem commanded it, not because of the health benefits.

Common Questions About Kosher

Is kosher food blessed by a rabbi? No. This is one of the biggest misconceptions, and I hear it all the time. Kosher is about the food itself — the ingredients, the preparation, and the process — not about a blessing. A rabbi does not wave his hand over a chicken and make it kosher. The chicken is kosher because it was slaughtered properly, inspected, salted, and prepared according to halacha.

Is kosher the same as halal? There are similarities (both prohibit pork, both require specific slaughter methods), but they are different systems with different rules. Halal food is not automatically kosher, and vice versa.

Can non-Jews eat kosher food? Absolutely. Kosher food is simply food that meets certain standards. Many non-Jews choose kosher products for quality or dietary reasons. I have had plenty of non-Jewish guests at my Shabbat table who loved every bite.

Is wine kosher? Wine has special kosher rules because of its historical use in pagan worship. Kosher wine must be produced entirely by Sabbath-observing Jews. Once opened, it should only be handled by observant Jews (unless it is mevushal — flash-pasteurized). And before you ask — yes, there is excellent kosher wine. We have come a long way from the sweet Manischewitz of your grandmother's Seder.