In a small saucepan, bring cucumber peels, chopped cucumber, sugar, water, and lime peels to a boil over medium heat. Continue to boil for 10 minutes. Remove from heat and let cool completely. Strain mixture through a fine-mesh sieve into an airtight container, discarding solids. Refrigerate for up to 2 weeks.
Notes
*We used mini cucumbers.
Recipe by Victoria at https://victoriamag.com/blackberry-gin-tonic-recipe/