In a bowl, mix together washed berries, salt, whey and sugar. Mash berries into a liquid sauce. Place into a clean, quart-size jar with a tight lid. Leave on the counter at room temperature to ferment for 48-72 hours.
After fermentation, stir in the maple syrup.* Store in the refrigerator for up to 2 months.
Recipe courtesy of Cultures for Health - photo courtesy of Recipe.com
For more fizzy syrup and one that’s less sweet, add the maple syrup to the berry mixture before you ferment.