Wash the ginger and lemon thoroughly under running water.
Peel the ginger and slice it thinly or grate it for stronger flavor.
Cut the lemon in half and squeeze out the fresh juice. Remove seeds.
Pour water into a saucepan and add the ginger slices.
Bring to a gentle boil, then reduce heat and simmer for 10–15 minutes.
Remove from heat and allow the ginger water to cool slightly.
Strain the liquid into a pitcher if desired.
Stir in the fresh lemon juice.
Taste and adjust with extra water or lemon juice if needed.
Serve warm or chilled over ice.
