Lacto-Fermented Mandarin Soda
This salt-free fermentation guide utilizes a mature sourdough rye kvass starter to culture a bright, carbonated mandarin soda through precise lactic acid bacterial activity
This soda is designed for exact food pairing. We use Lactic Acid Bacteria (LAB) to turn a mandarin base into a complex drink. Its sharp acidity and roasted rye notes make it a versatile culinary tool. It balances fatty roasted poultry and contrasts well with dark chocolate or coffee desserts.
The Role of Lactobacillus
The primary driver of this ferment is Lactobacillus. We introduce it using a mature, sourdough-cultured rye kvass. These bacteria convert sugars into lactic acid and carbon dioxide. This process creates a clean, tart flavor that is much smoother than kombucha.
The Sourdough Rye Kvass Starter
The success of this ferment depends on the mature rye kvass used as a starter. This kvass is brewed with toasted rye bread and raw sugar, then inoculated with a sourdough starter. We ferment the kvass at a cool 20–22°C to specifically cultivate a high concentration of LAB. By using a mature, active liquid culture instead of salt, we jumpstart the soda’s fermentation and ensure a dominant, healthy bacterial population from the first hour.
For the detailed authentic kvass recipe refer to this page:
Vacuum-Concentrated Flavor
We use Andros Chef Mandarin Confit instead of standard juice. This product is made in a vacuum chamber to remove water without using high heat. This method protects the fresh fruit aroma. It provides a consistent, intense citrus profile that does not fade during fermentation. This is our only source of sugar that utilizes the natural sugars of the fruit.
Temperature and Microbial Control
Keep the fermentation temperature between 20–22°C. This range helps the LAB stay active and healthy. It also prevents wild yeast from taking over. Proper temperature control ensures the soda stays crisp and avoids any “bready” off-flavors.
Lacto-Fermented Mandarin Soda Recipe
This guide produces 1 liter of high-acid soda for professional culinary use.
Ingredients
720 ml Water: Filtered and chlorine-free.
100 ml Mature Rye Kvass: Toasted rye base, sourdough-started (microbial starter).
180 g Andros Chef Mandarin Confit: 56% sugar content (mostly natural sugars of mandarin)
Note: This adds 100.8g of natural sugar, providing approximately 10°Bx to the mix.
Method
Combine the 180g of mandarin confit with 200ml of the water.
Whisk or blend until the mixture is completely smooth.
Add the remaining 520ml of water and the 100ml of mature kvass.
Pour the liquid into a 1L pressure-rated bottle.
Seal the cap tightly to trap the natural carbonation.
Ferment at a stable 20–22°C for 36–48 hours.
Chill the bottle to 4°C once it reaches the target pH to stop the fermentation.
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Denis Pashkov
cosmos society