![](https://www.saveur.com/uploads/2019/03/17/IFSKK5FHQRQ6XG5V6FQHHL2JMA.jpg?auto=webp&auto=webp&optimize=high&quality=70&width=1440)
This summer berry beverage is worth the trouble.
Ingredients
- 8 cups fresh blackberries
- 7 cups sugar
- 2 cups filtered water
- 2 tbsp. plus 2 tsp. tartaric acid
- Seltzer
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Instructions
Step 1
Put blackberries, sugar, filtered water, and tartaric acid into a nonmetallic jar. Stir gently with a wooden spoon to combine and cover tightly. Let stand for 24 hours, stirring occasionally, to allow sugar to dissolve.
Step 2
Strain mixture through cheesecloth without pressing on berries (discard berries). Divide blackberry liquid between sterilized bottles or jars, cover tops with clean cheesecloth, and secure with kitchen twine or a rubber band. Store in a cool, dark place for 3 weeks, until acid is thick and syrupy and slightly fizzy.
Step 3
To serve, add 2 to 3 parts seltzer or water to 1 part acid and serve over ice.
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