1-First Step: Prep the fruit and herbs Cut the seedless watermelon into cubes until you have about 12 cups, making sure it is deseeded and ready to go. Slice 1 cucumber in half, using one half for the puree or muddling step and the other half for garnish later. Rinse the mint leaves gently and pat them dry so they stay fresh and bright.

2-Second Step: Build the flavor base Place the watermelon, the cucumber half meant for the drink, mint leaves, and fresh lime juice into a cocktail shaker or sturdy pitcher. If you want a smoother drink, you can blend the fruit and cucumber briefly, then strain it before mixing. If you like a rustic mojito with a little texture, muddling works just fine. Muddle gently so the mint releases its oils without getting torn to bits. You want the drink to taste fresh, not grassy. If you are using a blender for the fruit, pulse only until the mixture is juicy and broken down.

3-Third Step: Add the rum and sweetener Pour in the 2/3 cup simple syrup and the 1/2 liter white rum. Stir or shake well to blend everything together. This is the point where the cocktail starts smelling like summer, with the sweetness of watermelon and the sharp little spark of lime meeting the rum. If you are making one serving, you can portion out the base into individual glasses. If you are making a pitcher for friends, give the mixture a good stir and taste it before adding bubbles. You can always add a touch more syrup if your fruit is not very sweet.

4-Fourth Step: Chill and strain if needed If your mixture is chunky, strain it through a fine mesh sieve into a clean pitcher or directly into serving glasses. This step is optional, but it makes the drink smoother and easier to sip. Press gently on the solids to get the good juice out without forcing in too much pulp. Set the base aside over ice or in the fridge for a few minutes if you want it extra cold. A cold base means the club soda will stay fizzy longer and the final drink will taste crisp from the first sip to the last.

5-Fifth Step: Add ice and bubbles Fill each glass with ice. Pour the watermelon cucumber rum mixture over the ice, leaving a little room at the top. Add club soda or sparkling water just before serving so the bubbles stay lively. Stir gently with a spoon so you do not knock out all that pretty fizz.

6-Final Step: Garnish and serve Finish each glass with watermelon slices, lime wheels, cucumber slices, and mint sprigs. Give the mint a little clap between your hands before tucking it in the glass. That simple move helps release the scent and makes the drink smell wonderful. Serve right away while the ice is still strong and the soda is fresh. This recipe is lovely for cookouts, porch nights, baby showers, pool days, or any time you want something cool and cheerful in your hand.