Countertop Milk Kefir with a Strawberry-Vanilla Second Ferment

By Sprig Originals ✓ · cooked up in Sprig

A living, tangy cultured milk drink you make on your kitchen counter with nothing but whole milk and a spoonful of kefir grains. The first ferment gives you a thick, lightly effervescent base somewhere between drinkable yogurt and buttermilk; a short second ferment with crushed strawberries and vanilla rounds off the tartness and builds a soft fizz. Once the grains are happy, this becomes a five-minute daily habit that keeps producing forever.

Ingredients

• 1 tbsp active milk kefir grains (about 15 g)
• 4 cups whole milk, pasteurized (not ultra-pasteurized), at room temperature

• 1 cup ripe strawberries, hulled
• 2 tbsp honey or maple syrup
• 1/2 tsp vanilla extract, or 1/4 vanilla bean, split
• 1 pinch fine sea salt

• ice cubes
• lemon zest or torn mint
• ground cardamom

Instructions

1. Wash a 1-quart (or larger) wide-mouth glass jar and a nylon or plastic fine-mesh sieve in hot soapy water and rinse thoroughly — no soap residue, no bleach, and no reactive metal such as aluminum or copper touching the grains. Stainless steel utensils are fine for brief contact.
2. Put the kefir grains in the jar and pour in 2 cups of the room-temperature whole milk (reserve the rest for tomorrow's batch). Stir gently with a wooden or silicone spoon. Cover the jar with a coffee filter, doubled cheesecloth, or paper towel secured with a rubber band — the culture needs airflow, not a sealed lid.
3. Set the jar somewhere out of direct sunlight at 68–76°F (20–24°C). Ferment 18–24 hours. A cool kitchen may need 30 hours; a warm one can finish in 14. It is done when the milk has visibly thickened, smells clean and tangy like fresh yogurt, and you see small pockets of whey separating along the sides when you tilt the jar.
4. Set the nylon sieve over a bowl or measuring cup and pour the kefir through, stirring gently with a silicone spatula to coax the thick liquid through. Do not press hard — you want the rubbery, cauliflower-like grains left behind intact. You should collect about 2 cups of finished kefir.
5. Return the grains straight to the rinsed jar (do not wash the grains themselves), add 2 more cups of room-temperature milk, cover, and start the next batch. Over a few cycles the grains will multiply; once they reach about 2 tablespoons, feed them 4 cups of milk per cycle or give the extras away.
6. For the second ferment, mash the strawberries with the honey and a pinch of salt in a bowl until juicy and broken down, about 1 minute. Stir in the vanilla.
7. Divide the strawberry mash between two 16-ounce swing-top or other pressure-rated bottles, then top with the strained kefir, leaving 1 1/2 inches of headspace. Seal, shake to combine, and leave at room temperature for 12–24 hours.
8. Burp the bottles every 12 hours by cracking the seal over the sink to release pressure — kefir builds carbonation fast with fruit sugar present. When you hear a distinct hiss, move the bottles to the refrigerator and chill at least 4 hours to stop the ferment and settle the fizz.
9. Open cold bottles slowly over the sink. Shake or stir to redistribute, pour over ice, and finish with lemon zest, mint, or a dusting of cardamom. Drink within 5 days, giving each bottle a gentle burp if it sits longer than 2 days.

Chef's tips

Nutrition (per serving, estimated)

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