Method

  1. Prepare the garnish and blend the base

    Scrub 300 g of English cucumber under cool running water with a clean produce brush. Rinse 12 g of fresh mint gently under cool running water, then pat both dry. Use a vegetable peeler to shave a few long ribbons from the cucumber, and reserve enough ribbons and small mint sprigs to garnish each glass. Cut the remaining cucumber into chunks. Add the chunks and remaining mint to a blender with 90 ml of fresh lime juice, 25 g of granulated sugar, 0.75 g of fine sea salt, and 240 ml of still water. Blend on high for 35 seconds, then check; continue briefly if any large pieces remain.

    00:35
  2. Strain the cucumber-mint base

    Pale green cucumber-mint base draining through a fine-mesh sieve into a clear pitcher

    Set a fine-mesh sieve over a large pitcher. Pour in the blended base and let it drain for 1 minute, then press the pulp gently with a silicone spatula until the flow slows to occasional drops. Do not force dry pulp through the mesh; that can make the cooler gritty and overly herbal. Taste the strained base and stir until the sugar is fully dissolved.

    01:00
  3. Build the cooldown glasses

    Highball glass half-filled with cucumber-mint base over ice before sparkling water is added

    Divide 560 g of ice cubes among the serving glasses. Pour the strained cucumber-mint base evenly over the ice, filling each glass about halfway. Top with 720 ml of sparkling water, pouring slowly down the inside of each glass to protect the bubbles. Stir each glass once from bottom to top, tuck in the reserved cucumber ribbons, add the mint sprigs, and serve immediately.

Cook's notePour the sparkling water slowly down the inside of each glass and stir once. More agitation releases carbonation before the cooler reaches the table.

Smart Substitutions

  • No sparkling water? Use still water in its place for a softer, non-fizzy cooler.
  • No lime juice? Use fresh lemon juice in the same amount; the flavor will be rounder and less floral.
  • No granulated sugar? Swap in a mild liquid sweetener, then blend and taste before adding more.
  • No mint? Use fresh basil in its place for a greener, lightly peppery finish.

Tips and Variations

  • Shave the garnish ribbons before cutting the cucumber into blender-size chunks.
  • Blend only until the cucumber breaks down; prolonged blending can make the mint taste grassy.
  • Pour the sparkling water last and stir once to keep the cooler lively.

What Went Wrong?

  • Cooler tastes bitter The mint was likely overworked or the pulp was pressed too hard. Add a splash of sparkling water and a small pinch of sugar, then stir once.
  • Base is too pulpy Pass it through a clean fine-mesh sieve again without pressing on the solids.
  • Flavor tastes flat Add lime juice a little at a time, then add a tiny pinch of salt and taste again.
  • Fizz disappears quickly Use freshly opened sparkling water, pour it slowly, and avoid repeated stirring.

Nutrition Estimate

Calories42
Protein1 g
Carbs11 g
Fat0 g
  • Fiber: 1 g per serving
  • Sodium: 75 mg per serving

Nutrition disclaimer:This recipe is provided for general cooking information only. Nutrition values are estimates and may vary by ingredients, brands, preparation methods, and serving sizes. Check ingredient labels and follow appropriate food-safety practices. This content is not medical, dietary, allergy, or professional food-safety advice.

FAQ

What kind of cucumber works best?English cucumber gives the cleanest flavor because its peel is thin and its seeds are small. A regular cucumber also works; peel thick or waxy skin and scoop out large seeds before blending.
Do I have to strain the base?No, but the drink will be thicker and more pulpy. Straining gives the cooler a cleaner sip and lets the carbonation stay more noticeable.
Why add sparkling water at the end?Blending would drive off much of the carbonation. Adding it after the base is strained and poured over ice keeps the bubbles active in the finished glass.