1 1/2 ounces light rum
1 fluid ounce simple syrup
1/2 fluid ounce freshly squeezed lime juice
1 teaspoon Blue Curacao, or to taste
1 cup ice
1/2 ounce cotton candy, or as needed (optional)
Combine rum, simple syrup, lime juice, and Blue Curacao in a cocktail shaker. Add ice, cover and shake until chilled, 10 to 15 seconds. Strain into a cocktail glass and garnish with cotton candy.