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What Makes Tonic Water Tonic Water
The defining ingredient in tonic water is quinine, extracted from cinchona bark. Quinine is intensely bitter — it is the compound responsible for tonic water's characteristic flavor and its historical use as an anti-malarial. Commercial tonic waters use a small, highly regulated amount of quinine (FDA limit: 83 ppm in finished beverages). This recipe uses cinchona bark to extract natural quinine at safe, sub-regulatory levels.
⚠️ Cinchona Bark Quantity Note
Use the quantities in this recipe exactly. Excessive quinine consumption can cause cinchonism (nausea, tinnitus, dizziness). At the dilution used here (approximately 1:8 syrup to water), finished tonic water contains quinine well within FDA limits. Do not significantly increase the cinchona bark quantity.Ingredients (makes ~400ml syrup / about 3L finished tonic)
- 3g (about ½ tsp) powdered cinchona bark (food-grade, available from homebrew and herbal suppliers)
- Zest of 1 lemon, 1 lime, 1 orange
- 2 lemongrass stalks, roughly chopped
- 5 cardamom pods, lightly crushed
- ¼ tsp citric acid
- 250g (1¼ cups) white sugar
- 400ml (1⅔ cups) water
- Juice of 1 lime (added after straining)
Method
- Combine cinchona bark, citrus zests, lemongrass, cardamom, and water. Bring to a simmer over medium heat.
- Simmer 20 minutes at a low, consistent simmer. The cinchona bark needs more extraction time than most botanicals.
- Strain through fine mesh or cheesecloth into a clean saucepan. Discard solids. The liquid will be yellow-tinged from the cinchona.
- Add sugar to the warm liquid. Stir over low heat until fully dissolved. Do not re-simmer — just warm enough to dissolve.
- Cool completely, then add lime juice and citric acid. Stir. Taste — it should be intensely bitter, citrusy, and complex.
- Bottle in glass, refrigerate. Keeps 4 weeks (high acid content aids preservation).
Making the Tonic
Combine 45–55ml tonic syrup with 300ml cold sparkling water. Serve over ice with a lime wedge. Standard ratio: 1:6. For a gin and tonic: 50ml gin, 40ml tonic syrup, 250ml sparkling water, ice, lime.
💡 Why Your Homemade Tonic Glows Under UV
Quinine is strongly fluorescent under ultraviolet light — it absorbs UV and re-emits it as visible blue light. This is why tonic water glows bright blue under a blacklight. A fun test to confirm your quinine extraction worked.FAQ
Where do I buy cinchona bark?
Homebrew supply shops (it is used in some beer recipes), herbal supplement retailers, and online (Amazon, Mountain Rose Herbs, homebrew suppliers). Look for food-grade or supplement-grade cinchona bark or powder. The powder extracts more efficiently but requires more careful straining than bark pieces.
Is homemade tonic water safe?
Yes, at the quantities in this recipe. The finished tonic water — syrup diluted 1:6 with water — contains quinine at levels well within FDA guidelines. People with G6PD deficiency, quinine sensitivity, or who are pregnant should avoid quinine-containing foods. If you have concerns, consult a healthcare provider.
Why does homemade tonic taste more bitter than commercial tonic?
Commercial tonic water is formulated for mass-market appeal — the bitterness is carefully calibrated to be mild enough for most palates. Homemade tonic made from whole botanicals tastes more complex and more bitter, which most enthusiasts prefer once they adjust. Start with a lower syrup-to-water ratio (1:8) and adjust up as you develop a taste for it.
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