Annatto

The seed colouring behind orange cheese and golden Caribbean rice alike — and the one ingredient in the cheese room whose history is a straightforward deception rather than a tradition. It was added to put back a colour that had been removed on purpose.

What it is

Annatto is a colouring extracted from the seeds of the tropical shrub Bixa orellana, sold to cheesemakers as a liquid. Its pigments are bixin and norbixin — carotenoids, which is why it reads as the same warm orange-yellow as the carotene in grass-fed milk.

It contributes essentially no flavour at the doses used in cheese. It is a colour, and only a colour.

🔴 The history, which is not the one usually told

The story people tell is that annatto is a traditional flourish. The mechanism says otherwise, and it is worth stating plainly.

β-carotene is fat-soluble. In summer, milk from cows on pasture carries enough of it to give a cheese a natural golden cast — and that colour was read, correctly, as a sign of rich milk. But when a dairy skimmed the cream off to make butter, the colour went with the cream, because the pigment lives in the fat. What was left made a paler, leaner cheese that looked exactly like what it was.

Annatto put the colour back without the cream.

That is why the coloured English cheeses are the skimmed ones — Gloucester, Red Leicester, Warwickshire — and why traditional cheddar was not among them. It is also why this ingredient sits slightly apart from the other cosmetic traditions in cheese: Morbier’s ash, Edam’s wax, Muenster’s painted rind and Dry Jack’s cocoa rub all had a real function once and outlived it. Annatto’s never did. It had a motive.

None of which makes it a bad ingredient. It makes it an honest one to understand, and it means one practical thing at the counter: an orange cheddar tells you only that somebody added annatto. It is not a grade, a strength or a sign of anything about the milk.

Outside the cheese room, where most cooks actually meet it

Annatto is a cheesemaking ingredient in this collection, but it is a kitchen ingredient across the Caribbean, Latin America and parts of Southeast Asia — and that is where most recipes linking here use it.

Whole seeds, sold as achiote, are steeped in warm fat or oil to make a golden-orange cooking oil; ground seed goes into achiote paste with spices and citrus. It does the same thing it does in cheese — colour, with very little flavour of its own — which is why it turns up in rice and bean dishes, in arepas, and in the broth of a Vietnamese cao lầu.

The practical difference is the form. For a vat of milk you want the liquid extract, which disperses evenly. For a pan of rice you want the seeds, steeped and strained, because the colour needs a fat to move into.

Using it

A few drops per gallon, diluted in cool unchlorinated water and stirred into the milk before the culture and rennet so it distributes evenly. Colour is a matter of taste and there is no wrong amount; there is only an uneven amount, which is what happens if you add it late.

It also turns up as a rind treatment rather than a paste colouring — the painted orange rind of an American Muenster is the same pigment doing a different job.

Substitutes (if absolutely necessary)

• Nothing — this is the easiest ingredient in the collection to leave out. The cheese is identical in every respect except colour, and paler is what most of these cheeses looked like before anybody reached for a bottle.
• Pasture milk, in season — the original source of the colour, if you can get it, and the only version that means anything.
• Note: turmeric, paprika and marigold are sometimes suggested and all three bring flavour with them. Annatto’s whole virtue is that it does not.

Where to find it

• Online: cheesemaking suppliers, in dropper bottles sized for exactly this. A bottle outlasts most hobbies.
• Local store: whole annatto seeds are common in Latin American and Caribbean groceries (as achiote), and are the same plant — but seeds are for infusing into fat or a marinade, not for colouring a vat of milk evenly.
• Storage: cool and dark. The pigment fades with light, which is the one thing that will quietly weaken a bottle you have had for years.