Begin by taking a sturdy glass and placing 10-12 fresh mint leaves along with 2 teaspoons of white sugar at the bottom. Using a muddler or the back of a spoon, gently press down and twist to release the aromatic oils from the mint, taking about 20 seconds.

Squeeze the juice of one medium-sized lime (about 1 ounce) directly over the muddled mint and sugar mixture in your glass. Stir gently with a spoon to blend the lime juice into the muddle, lifting some of the mint leaves to disperse their flavor further.

Add 2 ounces of white rum to the glass, carefully pouring it over the muddled mixture. Using the spoon again, stir the drink gently for about 15 seconds to ensure all the flavors combine harmoniously.

Generously fill the glass with ice cubes, about halfway to the top, allowing the chill to enhance your cocktail's refreshing nature.

Pour in about 4 ounces of sparkling soda water, allowing it to fizz and mingle with the other ingredients.

Finally, add a sprig of fresh mint and a slice of lime on top for a visually appealing garnish. Serve immediately with a straw or a cocktail stirring stick.