Place ginger root, sugar, and water into a medium saucepan.
Bring to simmer, and stir frequently until the sugar dissolves.
Continue to simmer for about 10 minutes then remove from heat. Allow the mixture to cool for at least 30 minutes.
Pour the ginger syrup through a mesh sieve to remove the ginger root.
Add the ginger syrup, lemon juice, and extra water to a pitcher and stir to combine.
Serve in individual glasses over ice.
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