Remove the outer peel of the lemon with a vegetable peeler, taking care not to include too much of the bitter white pith. Finely chop the lemon peel and ginger in a food processor.
Transfer the lemon-ginger mixture to a medium saucepan, add the sugar and water and bring to a boil. Reduce heat, and simmer, partially covered, for 15 minutes. Strain the mixture and cool. Cover and refrigerate for up to 1 week.
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