This refreshing Japanese marble soda captures the bright, tangy citrus flavor of the iconic bottled drink sold at summer festivals and convenience stores across Japan. The homemade version pairs a fresh lemon-lime syrup with crisp sparkling water, finished with a pinch of citric acid for that unmistakable sweet-and-tart pop. Serve ice-cold in tall glasses for an authentic izakaya-style refreshment.
Prep Time15 mins
Cook Time10 mins
Total Time25 mins
Servings4
Yieldabout 4 cups (1 quart) syrup, enough for 4 drinks
Nutrition Facts
Per serving (estimated)
- 135 kcalCalories
- 0 gFat
- 0 gSaturated Fat
- 35 gCarbs
- 0.5 gFiber
- 33 gSugar
- 0 gProtein
- 45 mgSodium
- 55 mgPotassium
- 10 mgCalcium
- 0.1 mgIron
- 15 mgVitamin C
- 2 mcgVitamin A
Ingredients
For the citrus syrup
- 1 cup (200 g) granulated sugar
- 1/2 cup (120 ml) water
- Zest of 1 large lemon
- Zest of 1 large lime
- 1/4 cup (60 ml) fresh lemon juice
- 2 tablespoons fresh lime juice
- 1/4 teaspoon citric acid
- Pinch of fine sea salt
For assembling the drinks
- 3 cups (720 ml) chilled sparkling water
- 1 cup ice cubes
- 4 thin lemon slices for garnish
- 4 thin lime slices for garnish
Directions
- Combine the sugar and water in a small saucepan over medium heat, stirring until the sugar fully dissolves and the mixture begins to simmer, about 3 minutes.
- Add the lemon zest and lime zest to the simmering syrup, reduce the heat to low, and steep for 5 minutes to release the citrus oils.
- Stir in the lemon juice, lime juice, citric acid, and salt, then remove the pan from the heat and let the syrup cool to room temperature, about 10 minutes.
- Strain the syrup through a fine-mesh sieve into a glass pitcher, pressing gently on the zest to extract the flavorful oils, and discard the solids.
- Fill four tall glasses with ice cubes, then pour 1/4 cup of the citrus syrup into each glass.
- Top each glass with about 3/4 cup of chilled sparkling water, stir gently to combine, and garnish with a lemon and lime slice before serving immediately for maximum fizz.
Cook’s Notes
- For the most authentic flavor, chill the sparkling water in the refrigerator overnight before mixing, as warm water will cause the carbonation to collapse quickly.
- Citric acid is sold at Asian grocery stores, pharmacy supply shops, and online; it adds the signature tart snap that distinguishes marble soda from ordinary lemonade.
- If you have traditional marble-seal glass bottles (maru-bin), funnel the syrup into the bottles first, then top with sparkling water, leaving a 1-inch headspace before seating the marble gasket and cap.
- Make a seasonal variation by adding 1/2 cup puréed fresh strawberries or 1/4 cup yuzu juice in place of part of the lime juice for a fruity twist.
- Leftover syrup keeps in a sealed jar in the refrigerator for up to 2 weeks; the flavor deepens slightly as it rests.










