A cheeseburger, if made of real cheese and real meat, can never be kosher. A hamburger made of meat from a kosher species could be kosher or not, depending on several other factors. Let me explain both — and then share something deeper.
What Makes Meat Kosher?
For meat to be kosher, the following must all be true:
The animal must be a kosher species — for land animals, one that has split hooves and chews its cud, such as a cow or lamb. The laws of slaughtering must be followed according to Jewish Law by a certified shochet (ritual slaughterer). The animal's lungs must be inspected and found to be smooth (glatt), indicating the animal was healthy as required by Jewish law. Certain fats, innards, and the sciatic nerve are removed. The meat is then salted to draw out the blood — which is also forbidden to be consumed — and then rinsed. Finally, the meat must be protected and packaged as kosher until it reaches the consumer.
Why Can't Meat and Dairy Ever Mix?
The Torah states three times: "Do not cook the calf in the milk of its mother." From this, the Oral Torah — the teachings Moses transmitted during the 40 years in the desert, eventually written in the Mishnah, Talmud, and Code of Jewish Law — derives three separate prohibitions: a Jew may not eat meat and milk together, may not cook them together, and may not derive benefit from such a mixture.
Kosher kitchens have entirely separate utensils for meat and dairy, because even residual tastes cannot be mixed. Jewish law also extends this to fowl — chicken and turkey with dairy — as a protective fence around the Torah.
The Deeper Question: Why Would G-d Care?
A reader once challenged me on Quora, calling these laws "reprehensible and childish" and suggesting they were a hoax added to sacred literature.
I want to address that directly — and respectfully — because it opens the door to one of the most important ideas in all of Torah.
There are three categories of Torah laws:
Mishpatim are laws that make logical sense — prohibitions against theft, murder, and other social harms. The Talmud says that even without the Torah, human beings could have arrived at these laws through reason alone.
Aidut are observances that testify to specific historical events — Passover celebrating the Exodus, for example. These we might not have invented on our own, but once we engage with them, we can find intellectual satisfaction in their meaning.
Chukim are Divine decrees that transcend human logic. They are like the decree of a king whose word is law — not because the decree is understood, but because he is the king. It is precisely in observing Chukim that the depth of loyalty and devotion is most revealed. If the king only commanded things you would do anyway, your obedience could be self-motivated. But when the decree goes against your grain — when it means never eating a cheeseburger or meatballs with parmesan — your faithful observance demonstrates true dedication.
The kosher dietary laws are Chukim. We keep them not because we fully understand them, but because G-d instructed us to in the Torah. And the fact that Jews have faithfully observed these laws for 3338 years, in every corner of the world, under every kind of pressure — this is itself one of the most powerful historical arguments for the giving of the Torah at Sinai.
If G-d did not give the Torah as described — in front of 3 to 4 million people — why would millions of people invent such "ludicrous" laws and then observe them faithfully across 33 centuries?
We do not consider any Torah law reprehensible or childish. They are laws given by G-d, the Creator. We understand that we are not capable of fully grasping the infinite. G-d's thoughts are not our thoughts, and G-d's ways are not our ways.
Consider: the gap in understanding between an infant and an adult is vast — yet it is infinitely closer than the gap between the Creator and our limited human intellect. A one-year-old cannot understand why she needs a painful vaccination. We understand perfectly. In the same way, we trust that what we cannot grasp about G-d's commands does not make them any less wise or loving.
Observing the Torah — its laws for Jews, and the Seven Laws of Noah for all of humanity — is the path G-d gave us to connect to Him and fulfill His will. When we subjugate our own intellect and desires to G-d's will as communicated in the Torah, that subjugation itself is the connection. That is why I am genuinely happy not to eat dairy and meat together.