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Active Time
40 minutes
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Total Time
7 days or longer
The ginger "bug," which jump-starts the fermentation, specifically uses organic ginger because it's rich in microbes. You'll have extra bug; use it to make more grape soda, or try 4 cups fresh unpasteurized apple juice in place of grape.
Ingredients
Makes 1 quart
Special Equipment
Step 1
Stir 1 teaspoon ginger, 1 teaspoon sugar, and 4 cups water in a 32-ounce canning jar to combine. Cover jar with cheesecloth; secure with a canning jar band (without lid). Let sit 1 day out of direct sunlight at room temperature.
Step 2
Stir in 1 teaspoon ginger and 1 teaspoon sugar and let sit 1 day. Repeat twice more. Mixture (ginger bug) should have bubbles throughout and release more when agitated.
Step 3
After 3 days, purée grapes in a blender until smooth. Strain, pressing on solids (you should have about 4 cups juice).
Step 4
Combine juice and 1/2 cup ginger bug in a large nonreactive bowl. Cover with cheesecloth; secure with a large rubber band. Let sit out of direct sunlight at room temperature, skimming white mold from surface, until mixture is slightly foamy and releases bubbles when stirred, 3-4 days. Strain into bottle, cap, and let sit at room temperature until bottle feels pressurized, about 1 day longer. Chill.
Step 5
DO AHEAD:Soda can be made 2 weeks ahead. Keep chilled.
Nutrition Per Serving
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