1/2 teaspoon ground cinchona bark or quinine (see Note)
1 teaspoon citric acid powder or lemon salt (see Note)
How to Make It
In a small saucepan, bring the water to a boil. Stir in the sugar, lime, lemongrass, cinchona bark and citric acid powder. Simmer over moderate heat for 15 minutes. Strain through a coffee filter into an airtight container and refrigerate for up to 3 weeks.
The bark of cinchona trees produces quinine and it gives homemade tonic water an alluring bitterness. You can buy quinine powder from rain-tree.com. Citric acid or lemon salt is a key ingredient in homemade grenadine, citric acid is a nonalcoholic preservative derived from citrus fruit that also adds tang. Available from bestturkishfood.com.
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