Recipes

Milk Kefir

Less a recipe than a pet. You do not make a batch of kefir — you keep a culture alive and it makes batches for you, indefinitely, as long as you feed it. The load-bearing fact is that you cannot create kefir grains: every grain on earth descends from another grain, and you must be given them or buy them live.

Fermented · Dairy · Drink

Milk Kefir
Prep 5 minutes
Cook 12–24 hours
Serves Makes 1 quart daily
Level Easy

Less a recipe than a pet. You do not make a batch of kefir — you keep a culture alive and it makes batches for you, indefinitely, as long as you feed it. The load-bearing fact is that you cannot create kefir grains: every grain on earth descends from another grain, and you must be given them or buy them live.

Ingredients

  • 1 Tbsp milk kefir grains per cup of milk
  • Whole dairy milk
  • A glass jar and a plastic or stainless sieve

Directions

  1. Key ingredients
  2. Live kefir grains and dairy milk. Nothing else, ever.
  3. Put the grains in milk — roughly 1 Tbsp of grains per cup — in a glass jar.
  4. Cover LOOSELY. Kefir contains yeast and produces CO2, so it must vent. A cloth and a band, or a lid resting on top. Do not seal it tight; jars have broken.
  5. Leave 12–24 hours at room temperature. It is done when thickened and smelling tangy and yeasty. Warmer is faster.
  6. Strain the grains out. Plastic or stainless sieve; do not press, just let it pass. Stainless is fine — the ‘never let metal touch kefir’ rule is overstated folklore, though genuinely reactive metals like aluminium or unlined cast iron should not touch acidic kefir.
  7. Put the grains straight into fresh milk. That is the whole loop, forever.
  8. Optional second ferment: leave the strained kefir at room temperature another 12–24 hours, with fruit or citrus peel if you like. It gets fizzier and more complex, AND more of the lactose is consumed — which makes it easier on the lactose-intolerant.

Notes

PROVENANCE. Mine. The grains came from another fermenter, because that is the only way they can come.

WHY YOU CANNOT MAKE GRAINS FROM SCRATCH. A grain is not a clump of bacteria — it is a structured matrix of KEFIRAN, a polysaccharide produced by Lactobacillus kefiranofaciens subsp. kefiranofaciens (the sister subspecies kefirgranum does NOT make it), housing a stable consortium of roughly 30 to 60 species of lactic-acid bacteria, acetic-acid bacteria and yeasts. Nobody has assembled one from a defined starter. The internet is full of articles claiming otherwise and they are wrong; at best they make a kefir-flavored drink that will never grow into grains. A powdered ‘kefir starter’ likewise does not grow grains.

IT IS NOT YOGURT and people expecting yogurt are often put off. Thinner — drinkable rather than spoonable. More sour. Slightly effervescent. And with a distinct yeasty, almost bread-like note underneath. It also contains a little alcohol, typically well under 1%.

TOO SOUR means ferment less time. That is nearly always the fix.

TAKING A BREAK: grains keep 2–3 weeks in fresh milk in the refrigerator. Expect a couple of sluggish cycles when you restart.

THE GRAINS CANNOT LIVE ON PLANT MILK — they need lactose. You can ferment a plant milk with kefir LIQUID, but the grains must be rested in dairy regularly or they starve.

The grains multiply. You will end up with more than you need — give them away, which is how you got yours.