Your first jar of milk kefir (without wrecking the grains)

Milk kefir looks fussy until you’ve done it once. After that it’s mostly: milk in, lid on, wait, strain, repeat.

This is for a first jar — the kind you make on a Stellenbosch kitchen counter without special kit beyond grains and a jar.

What you need

• Milk kefir grains — ours come dehydrated, so rehydrate them first using the instructions in the pack (a tablespoon of active grains is plenty to start)
• A clean glass jar (about 500 ml–1 L)
• Fresh cow’s milk — full cream works best for beginners
• A plastic or stainless strainer (not fine metal mesh that shreds grains)
• A breathable cover: muslin + elastic, or a loose lid

If you’d rather start with everything in one box, the Milk Kefir Starter Kit covers jar, grains and the basics. Already brewing? Top up with milk kefir grains.

The simple method

1. Put the grains in the jar.
2. Pour over milk — roughly 250–500 ml for a small spoon of grains. Leave headspace.
3. Cover so air can move but dust can’t. Don’t seal it airtight for this first ferment.
4. Leave at room temperature, out of direct sun. In a warm Cape kitchen that often means 18–24 hours. Cooler rooms take longer.
5. When it smells pleasantly tangy and looks lightly set or thickened (not rotten), strain the grains out. Drink or chill the kefir. Put the grains straight into a fresh jar of milk.

How you know it’s ready

Ready kefir smells clean and yoghurt-y, not like spoiled milk. It may separate a little — that’s normal. If it smells sharp like cheese left in the sun, or you see fuzzy mould, don’t taste it. Toss the liquid, rinse the grains gently in fresh milk (not chlorinated tap if you can help it), and start again in a cleaner jar.

Mistakes that actually wreck grains

• Metal abuse: prolonged contact with reactive metal. Use glass and plastic/stainless for straining.
• Starving them: leaving grains in the same milk for days after it’s done. Strain and feed daily once they’re going.
• Heat: sitting on a sunny windowsill or next to an oven. Warm room is fine; hot is not.
• Chlorine shock: rinsing under strong tap water. Prefer a splash of milk if you need to rinse.

Taking a break

Going away for a few days? Fresh milk in the fridge slows the grains down. For longer, ask us about giving your grains a proper rest — don’t just abandon a jar on the counter for a fortnight.

That’s it. One jar, then another. The grains grow if you’re consistent; share a spoon with a friend when you have extra.