In a small saucepan, combine equal parts granulated sugar and filtered cold water. Heat over low heat, stirring frequently until the sugar completely dissolves, about 5 minutes.

While the syrup cools, prepare the lemons by rolling them on the counter. Cut in half and squeeze out about 1 cup of freshly squeezed lemon juice, straining out any seeds.

In a large pitcher, mix cooled simple syrup, lemon juice, and about 4 cups of filtered cold water. Stir gently.

Gradually add black food coloring or activated charcoal until reaching desired darkness, mixing well.

Fill glasses with the lemonade, garnish with black sugar, lemon wheels, or cocktail picks, and serve.