Yoghurt & Cultured Dairy: The Complete Walkthrough
This guide covers yoghurt & cultured dairy, rated an easy task, typically taking 6–12 hrs.
This is the expanded version of our yoghurt & cultured dairy guide, for anyone who wants the full detail rather than just the quick-reference card.
Culture, incubate, chill
Cultured dairy products rely on beneficial bacteria (or, for kefir, a bacteria-yeast culture) fermenting milk at a specific temperature over several hours — a small amount of a previous batch can usually restart the next one.
Before You Start
A few things matter most here:
- Fresh milk
- A starter culture (a small amount of live yoghurt, a yoghurt culture sachet, or kefir grains)
- A thermometer
- A means of holding a consistent incubation temperature (a warm oven, an insulated container, or a yoghurt maker)
How It's Done
The key things to get right:
- 1. Heat milk to just below boiling, then cool to the culture's specified incubation temperature (usually around 40–45°C for yoghurt).
- 2. Stir in the starter culture thoroughly.
- 3. Hold at incubation temperature for several hours, undisturbed, until set.
- 4. Chill thoroughly before eating or further processing (straining for a thicker, Greek-style yoghurt).
- 5. Save a small amount of the finished batch as starter culture for the next one.
Common Issues
A few things matter most here:
- Yoghurt doesn't set — incubation temperature too low, or the culture wasn't active/live; check both.
- Runny texture — normal for some milk types; strain through cloth for a thicker result if desired.
- Sour or off flavours developing over successive batches — culture can weaken or become contaminated after many generations; refresh with a new starter culture periodically.
- Kefir grains not thriving — check they're getting fed regularly with fresh milk and aren't left too long between batches.
Keeping It Going
Best time — any time milk is available; a very approachable year-round project. Duration: 6–12 hours incubation, depending on the culture and desired tartness. Maintenance — if maintaining a continuous culture (like kefir grains), regular feeding with fresh milk. Signs of success — a clean, set texture (for yoghurt) with a pleasant tang, no separation beyond a little natural whey.
That's the full walkthrough. The printable A4 quick-reference card for this is on the main guide page below.