What Cheese Actually Is

Cheese is milk with the water taken out and time put in.

That is the whole thing. Everything else on this site — the presses, the moulds, the wax, the two years of patience on a hard wheel, the fridge in my basement with motors in it — is machinery for doing that one job in a particular way. I find it genuinely useful to keep coming back to that sentence, because cheese has a reputation for being complicated and mostly it isn’t. It is four ingredients and one trick.

The four ingredients

Nearly every cheese in the world is made from some combination of these, and no others.

Milk. Cow, goat, sheep, buffalo, or something less common — and this matters more than people expect, because the animal decides the fat and protein you have to work with before you touch anything. Milk is roughly 87% water, and the rest is fat, protein, milk sugar, and minerals. Cheese is the business of keeping the fat and protein and getting rid of the water.

A coagulant — something to make the milk set. There are two ways to do it, they are chemically different, and they give you two different families of cheese. Acid (vinegar, lemon juice, or the lactic acid that bacteria make for you) or an enzyme (rennet). My first cheese used the first one. I did not own any of the second.

Salt. Not for flavour, or not only for flavour. Salt pulls out more water, slows the bacteria down so ripening happens at a walk instead of a sprint, and makes the surface hostile to things you don’t want growing. A cheese without salt doesn’t taste bland; it goes wrong.

Bacteria, and sometimes moulds. These are the ones doing the actual work. They eat the milk sugar, make acid, and then spend weeks or months slowly taking the proteins and fats apart into the compounds we taste as flavour. Fresh cheese tastes of milk. Aged cheese tastes of what the microbes did to milk.

That’s it. Cheddar and Camembert and Parmesan and feta are all built from the same four things. What separates them is not the ingredient list — it’s what you do to the curd, and how long you wait.

The one trick

Milk protein — casein — floats around in milk as tiny bundles called micelles, held apart from each other because they carry a like charge and repel. Milk is a stable liquid because those bundles never touch.

Making cheese means breaking that stability, and there are exactly two ways to do it.

Add acid, and you neutralise the charge that holds them apart. They stop repelling, clump, and drop out as a soft curd. This happens on its own if you leave raw milk somewhere warm, because the bacteria already in it make the acid for you — which is why this is very likely the older way, and why it costs nothing. Acid curd is delicate, it doesn’t stretch or melt well, and it does not age. This is cottage cheese, ricotta, paneer, quick mozzarella, cream cheese.

Add rennet, and instead of neutralising the charge you snip off the piece of protein that carries it. The bundles are then free to link up to each other directly, so what you get is not a clump but a network — a continuous gel. That gel can be cut, cooked, pressed, and aged for years. Every hard cheese on earth is on this side of the line.

Same milk. Same visible result — white curd sitting in yellowish whey. Completely different material, because one is a precipitate and the other is a structure. When I finally understood that, half the things I’d been doing wrong made sense. You cannot make cheddar with vinegar, and no amount of technique will fix it.

Then you drain, and every decision after that is really the same question asked in different ways: how much water are you leaving in? Cut the curd fine and more whey escapes. Cook it hotter and the curd shrinks and expels more. Press it harder, salt it heavier, age it longer and drier — less water every time. A fresh cheese is 80% water and lasts a week. Parmesan is about 30% and lasts years. Soft, semi-hard and hard aren’t really three kinds of cheese; they’re three points on one dial.

Why anybody bothered

Milk is a nearly perfect food with a fatal flaw: it spoils in hours, and it arrives on a schedule you don’t control, in quantity, in spring and summer, exactly when there’s plenty of other food about. Cheese fixes all of that at once. It concentrates the nutrition, discards the water microbes need to live, and turns a perishable daily trickle into something you can stack on a shelf, carry over a mountain, sell, tax, and eat in February.

There’s a lactose angle too, and it’s real — draining the whey takes most of the milk sugar with it, and the bacteria eat much of what’s left as the cheese ripens, which is why a lot of people who can’t drink milk can eat aged cheese without trouble. It gets told as the reason cheese was invented. The best current research says that’s too tidy, and the honest version is more interesting: I’ve put it, with the papers, in how cheese was invented.

Why I make it, given that it’s in every shop

This is the fair question, and it’s different from the answer I’d give about most of what I make. Bread, sausage, syrup, worcestershire — I make those partly because what you can buy is a shadow of the real thing. That argument does not work for cheese. Cheese is available everywhere and some of it is superb. I am not going to out-Comté the Jura.

So it isn’t about beating the shops. It’s that cheese is the most interesting thing I make. Four ingredients and a dial, and the dial has a hundred positions — change the cut, the cook, the press, the salt, the humidity, the months, and you get a different cheese out of the same gallon of milk. It rewards fiddling more than anything else in my kitchen. Smoked flake salt instead of plain in the mozzarella. A slightly wetter curd. Three more weeks.

And then there’s the part that isn’t rational at all, which is putting something on the table that took me eight months and being able to say: I made that.

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Next: the family tree — how the dial above turns into the dozen families every cheese in the world belongs to. Or start at the beginning, with how cheese was invented.