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Ingredients
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Cucumber-Citrus Base
Mint & Aromatics
Chill & Serve
Method
Cucumber-Citrus Base
Prepare and puree cucumber
Trim ends from the English cucumber, peel if skin is thick (optional). Roughly chop and place in a blender. Add the fresh lime juice, fresh lemon juice, and simple syrup. Blend on high until fully pureed and smooth, about 30–45 seconds.
Strain the cucumber-citrus puree through a fine-mesh sieve or chinois into a pitcher, pressing with the back of a spoon to extract as much liquid as possible. Discard solids. You should end up with a bright green, smooth base.
Add 400 ml cold water to the pitcher and stir to combine. Taste and adjust sweetness or acidity: add up to 15 ml more simple syrup for more sweetness or 10–15 ml more lime juice for more brightness.
Mint & Aromatics
Gently clap 8 of the fresh mint leaves between your palms to release their aroma, then add them to the pitcher. Use a wooden spoon or muddler to bruise the leaves lightly in the pitcher (5–8 gentle presses) to release oils without shredding them.
Stir in the grated lemon zest to lift fragrance. Allow the mixture to rest in the refrigerator for 15–20 minutes so flavors meld. Strain out mint leaves and any remaining solids if you prefer a clear cooler; otherwise leave some for visual appeal.
Chill & Serve
Fill four serving glasses with ice cubes (about 1 cup per glass). Divide the cucumber-citrus base evenly among the glasses, leaving ~60–80 ml headroom in each for soda.
Top each glass with club soda or sparkling water, approx. 75 ml per glass (300 ml total), and stir gently once to combine.
Garnish each glass with 1–2 cucumber slices, 1 mint sprig, and a small pinch of additional lemon zest on top. Serve immediately while cold.
Optional: For a longer-keep batch, store the strained cucumber-citrus base separately in the refrigerator for up to 48 hours. Add soda and ice only when ready to serve to preserve effervescence.