01 - Combine sugar and 1/2 cup water in a small saucepan. Heat over medium heat, stirring constantly until sugar completely dissolves. Remove from heat and allow to cool to room temperature.
02 - In a large pitcher, combine freshly squeezed blood orange juice and lemon juice, stirring to blend evenly.
03 - Pour the cooled sugar syrup into the citrus mixture. Stir thoroughly to incorporate the sweetness throughout the juice base.
04 - Add 3 cups cold water or sparkling water to the pitcher. Stir well to combine all ingredients into a homogeneous lemonade.
05 - Taste the lemonade and adjust sweetness or acidity as desired by adding additional sugar or citrus juice as needed.
06 - Fill serving glasses with ice cubes and pour the lemonade over the ice. Garnish with blood orange slices, lemon slices, and fresh mint if desired. Serve immediately.