How to Make Black Raspberry Kvass

Black Raspberry Kvass

Black raspberry kvass is a kid-friendly fermented fruit drink that is easy to make at home. It's also a healthful alternative to commercial sodas.

Course Drinks
Cuisine American
Prep Time 10 minutes
Total Time 10 minutes
Servings 1 quart
Author Craig Fear


  • 1 cup black raspberries
  • 1 TBSP honey
  • 1 quart filtered water
  • 1/4 cup whey, optional though recommended)


  1. Place raspberries and honey (no need to heat, it will dissolve) in the jar and add water up to one inch below the top of the jar. Like so:

    black raspberry kvass fermenting in a mason jar
  2. Most of the raspberries will rise and float on the surface.  Simple shake the jar once or twice a day to prevent bacteria from forming on the surface.
  3. Leave the jar at room temperature for 2-3 days to allow it to ferment.  Each day the water will take on a darker purple color from the infusion of the black raspberries.  

  4. After a day or two it will start to bubble from the fermentation process.  Burp the jars once a day by opening the lid to allow the gasses to escape.  Put the lid back and taste the kvass after 2 days.  It's ready when it tastes good!  This usually happens around day 3-4.  It should be slightly sweet but slighty sour.  Trust me, you'll know it.  If it tastes flat, let it keep fermenting.  Things ferment faster in warmer weather.
  5. Strain out the black raspberries.  They'll have lost most of their flavor to the kvass but you could save them and add them to a smoothie.