If coriander is biltong’s signature, vinegar is its bodyguard. You barely notice it when it’s done right — just a faint tang behind the spice — but it’s quietly doing the two most important jobs in the whole process.

Job one: keeping the meat safe

Biltong is raw beef hung in open air for the best part of a week. The reason that’s been safe for a few centuries — long before fridges — is acidity. A vinegar soak drops the pH at the surface of the meat, making it hostile territory for the bacteria you don’t want, while the salt draws out moisture and the airflow finishes the job.

It’s a three-part defence: acid, salt, air. Remove any leg and the stool falls over. This is also why “biltong” recipes that skip the vinegar soak make food safety people nervous, and why we never will.

Job two: the tang

That gentle sourness in a good slice of biltong — the thing that makes you reach for the next piece — is the vinegar talking. It brightens the beef the same way a squeeze of lemon rescues a rich dish. Without it, dried beef tastes flat and one-dimensional, like a sentence with no punctuation.

The trick is restraint. The meat gets a few hours in vinegar, not a swim for days. You want seasoning, not a pickle. (Where the soak fits in the whole process: how we make our biltong.)

Which vinegar?

Tradition says brown malt vinegar, and tradition is right. It’s mellow, slightly sweet, and rounds out the beef instead of shouting over it. That’s what goes into every Kured batch.

  • Cider vinegar — the respectable alternative. Fruitier, a touch sharper. Plenty of good makers use it.
  • Red wine vinegar — works, adds a certain Sunday-lunch depth.
  • White spirit vinegar — technically functional, spiritually chip-shop. Harsh. We’d rather not.
  • Balsamic — no. Someone always asks. No.

The test batch that proved it

Early on, we ran a side-by-side: identical spice, identical cut, one batch with the traditional vinegar soak and one with just a spritz. Six days later the difference was embarrassing. The proper soak gave a deep mahogany colour and that clean tang; the spritzed batch tasted like something that had merely been near biltong once.

Some steps in this craft are negotiable. The vinegar isn’t.