Soda Water
Ingredients
Directions
Prepare the keg
Ensure the keg is air-tight and fill it two-thirds with clean soft water.
Add 1 to 3 ounces each of supercarbonate of soda and tartaric acid, coated in sugar.
To coat, stir the soda and acid into hot melted sugar and let it cool.
Seal and serve
Close the keg immediately with a good spigot.
To serve, mix 2 tablespoons of syrup in a glass and fill with soda water.
Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.
Explore the science
What each ingredient does
- Supercarbonate of soda
- Reacts with the acid in water to release carbon dioxide, which carbonates the liquid.
- Tartaric acid
- Reacts with the soda to release carbon dioxide and gives the water a sharp, tart taste.
- Sugar
- Coats the powders so they react gradually in the water rather than all at once.
The step that matters
Close the keg immediately. The soda and acid release carbon dioxide as they dissolve. Carbon dioxide dissolves into water only under pressure, so leaving the keg open lets the gas escape and the water stays flat.
“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.
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