In a high-powered blender, combine the sliced strawberries with the cold water. Blend on high speed until the mixture is completely smooth and well combined.
Using a fine mesh sieve, strain the blended strawberry mixture into a large pitcher. Gently press the mixture with a spoon to extract as much juice as possible while leaving the seeds behind.
To the pitcher, add the freshly squeezed lemon juice, then sprinkle in the granulated sugar. Stir the mixture thoroughly until the sugar is fully dissolved, ensuring a balanced sweetness.
Gradually pour in the sparkling water to the pitcher. Using a gentle stirring motion, mix well to combine all the ingredients. Taste the punch and adjust the sweetness by adding more sugar if desired, mixing well after each addition.
Fill tall serving glasses with ice cubes. Carefully pour the refreshing strawberry lemonade punch over the ice, filling the glasses to your desired level.
For a beautiful presentation, garnish each glass with a slice of lemon, a whole strawberry perched on the rim, and a few fresh mint leaves for an aromatic touch.
Notes
Adjust the sweetness according to your preference.