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Bring out your blender, and pour the water into it.
Add Sodium Alginate gradually as the water blends.
Blend for 2-3 minutes until it is well dissolved.
Pour into a container and set aside in the refrigerator for 2 hours.
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Bring out your blender again, and blend all the wet ingredients (tonic, cucumber juice, lime juice, and gin)
While the blender is running, gradually add the dry ingredients (sugar, calcium lactate, and xanthan gum)
Pour the mixture into a silicone mold shaped like small, round ice cubes.
Place the mold in the freezer - and wait until they are frozen.
Now take the Sodium Alginate mixture out of the refrigerator, and pour it into a pot.
Heat the mixture to 50°C - use a thermometer.
When the Sodium Alginate mixture reaches 50°C, pour it into a bowl.
Add the frozen spheres to the mixture - a few at a time.
Stir gently.
Then take the spheres out of the Sodium Alginate mixture, and transfer them to a container with cold water.
Transfer the now "clean" spheres to another container - they are ready for serving.
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Carbonation simply means adding fizz or CO2 to the spheres.
Pour tonic water into a siphon bottle.
Then carefully transfer your finished spheres into the siphon bottle.
Attach a gas cartridge to the holder, and fill with CO2. Let the siphon bottle sit for 2 hours.
After 2 hours, unscrew the lid and gently pour out the carbonated spheres.
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