In a cocktail shaker, mix the freshly squeezed lemon juice with maple syrup or honey, adjusting the sweetness to taste.
Add a small amount of activated charcoal. Remember, a little is all you need to achieve the striking black color.
Fill the shaker with ice and shake vigorously to blend the ingredients thoroughly.
Strain the mixture into a glass already filled with fresh ice.
Pour in sparkling water or soda to top off the drink, giving it a refreshing fizz.
Garnish with a twist of lemon zest for an elegant finishing touch, and serve immediately.