In a mixing glass, place the fresh mint leaves and sugar. Use a muddler to gently press the mint leaves to release their oils.

Pour in the cold water and stir until the sugar is completely dissolved.

Fill your glassware with crushed ice to the brim.

Strain the mint mixture over the ice-filled glass.

If using, slowly pour the bourbon over the mixture.

Gently stir the drink to combine all the flavors.

Garnish with a sprig of fresh mint and serve immediately.