drink · Drink

How to Make Kefir at Home

Name: How to Make Kefir at Home
Yield: 1
Ingredients: 1 tablespoon kefir grains; 2 cups whole milk

Making kefir at home requires kefir grains and milk. Place a tablespoon of grains in a jar, add 2 cups of milk, cover with a breathable cloth, and let sit at room temperature for 12-24 hours until thick and tangy. Strain out the grains and your kefir is ready to drink.

Total time: 12-24 hr
Hands-on: 10 min
Serves: 1
Difficulty: Easy

Ingredients

1 tablespoon kefir grains
2 cups whole milk

Step by step

Prepare your jar. Use a glass jar, never metal. A wide-mouth mason jar works perfectly. Make sure it's clean but don't sterilize it - you want some beneficial bacteria around.
Add the kefir grains. Place 1 tablespoon of kefir grains in the bottom of your jar. Fresh grains look like small cauliflower florets. If using dehydrated grains, rehydrate them first according to package instructions.
Pour in the milk. Add 2 cups of whole milk. Room temperature milk works faster, but cold is fine. The grains will work with any milk fat content, but whole milk gives the best texture.
Cover and wait. Cover the jar with a coffee filter, cheesecloth, or breathable cloth secured with a rubber band. Never use an airtight lid - the kefir needs to breathe. Leave at room temperature.
Check for doneness. After 12 hours, give the jar a gentle swirl. When the milk thickens and smells tangy like yogurt, it's ready. In winter this takes 18-24 hours, in summer maybe just 12 hours.
Strain the kefir. Pour everything through a plastic mesh strainer into a bowl. Gently stir the grains with a plastic spoon to help the kefir pass through. Never use metal tools with the grains.
Store and restart. Transfer your finished kefir to a clean jar and refrigerate. Put the grains back in your fermenting jar with fresh milk to start the next batch.

Tips & troubleshooting

Healthy grains multiply over time. Share extras with friends or dry them for backup storage.
If your kefir separates into curds and whey, it's over-fermented but still safe to drink. Just ferment for less time next batch.
Grains can be stored in the refrigerator in milk for up to a week, or frozen in milk for longer storage.
The ideal room temperature is 68-70°F. Warmer speeds fermentation, cooler slows it down.
Your kefir should smell tangy and yeasty, never putrid. Trust your nose - bad smells mean something went wrong.

Variations

Coconut milk kefir. Use full-fat canned coconut milk instead of dairy. The grains need to be 'fed' regular milk every few batches to stay healthy.
Second fermentation. Add fruit, herbs, or spices to finished kefir and let it sit another 12-24 hours for flavored kefir with more tang.
Thick kefir. Strain finished kefir through cheesecloth for several hours to remove whey and create a yogurt-like consistency.
Quick kefir. Use more grains (2-3 tablespoons) to speed up fermentation to 6-8 hours, perfect when you need kefir fast.

Questions

How do I know if my kefir grains are alive?: Active grains will cause milk to thicken and develop a tangy smell within 24 hours. Dead grains won't change the milk at all. Healthy grains also grow slowly over time.
Can I use non-dairy milk?: Coconut milk works well, but other plant milks don't provide enough nutrients for the grains long-term. Alternate with dairy milk every few batches to keep grains healthy.
What if my kefir tastes too sour?: Reduce fermentation time or use more milk with the same amount of grains. Temperature also matters - cooler spots in your kitchen will slow the process.
How long does homemade kefir last?: Fresh kefir stays good in the refrigerator for about a week. It continues to slowly ferment and will get more sour over time, but remains safe to drink.
My grains aren't growing - what's wrong?: Grains need consistent feeding with fresh milk. If you've been irregular or used ultra-pasteurized milk, they might be stressed. Feed them daily with fresh whole milk for a week to revive them.