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Dairy ferment

Cultured butter

Intermediate

Cream soured with cultures before churning, for a fuller, slightly tangy butter.

Temperature
10–24 °C
Culture at 20–24 °C; churn cool (about 10–13 °C).
Time
12–24 hours culturing + 20 minutes churning

Timeline

Cultured butter timeline

  1. Stage 1: Culture the creamstart · about 18 h

    Fermenting / waiting — 20–24 °C

  2. Stage 2: Chill, churn & washfrom 18 h · about 2 h

    Hands-on — 10–13 °C

  3. Stage 3: Storefrom 20 h · keeps about 3 weeks

    Cold storage — Fridge 2–3 weeks; freeze longer

Ingredients

  • 1 litre pasteurised double/heavy cream (not UHT for best results)
  • 2 tbsp live cultured buttermilk, crème fraîche, or a mesophilic culture
  • Salt (optional, about 1–2% of butter weight)

Equipment

  • Jar
  • Stand mixer or food processor
  • Sieve
  • Bowl of iced water
  • Wooden paddles or spatula

Steps

  1. Stir culture into the cream; cover and keep at 20–24 °C for 12–24 hours until thick and tangy.
  2. Chill to about 10–13 °C (an hour or two in the fridge).
  3. Whip on medium past whipped cream until it suddenly breaks into yellow grains and liquid.
  4. Strain off the buttermilk (keep it for baking).
  5. Wash the butter in iced water, kneading, until the water runs clear.
  6. Knead out remaining water, salt if you like, shape and chill.

Is it working?

  • Cream thick and tangy before churning
  • Clear wash water at the end

Smell & texture: Sweet-tangy, buttery; smooth and firm when cold.

Signs tell you it's fermenting, not that it's safe: never rely on smell or appearance alone.

Safety, mould and discard rules

Mould or yeast?

Dairy ferments should not grow anything on the surface. Any fuzz, spots or coloured patches (pink, orange, green, black) mean contamination: discard the whole batch — don't scrape it off.

Storage

Wrap and refrigerate; freeze for longer.

Shelf life: About 2–3 weeks in the fridge if well washed; months frozen.

The science: what's happening

Mesophilic cultures sour the cream and make diacetyl, butter's aroma. Churning then breaks the fat globules' membranes so fat clumps into butter, leaving buttermilk.

Organisms

  • Mesophilic lactic cultures (Lactococcus lactis incl. diacetylactis, Leuconostoc)

Troubleshooting

Won't break
Cream too cold or too warm — aim for 10–13 °C and keep going.
Greasy butter
Cream too warm when churned.

A dish (not a ferment) gone wrong? Try Recipe Rescue.

Learn more

Sources

Guidance changes: check the source for current wording. Original text; figures quoted from the sources where stated.