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 fresh blood orange juice and lemon juice. Stir to blend evenly.
03 - Pour the cooled sugar syrup into the citrus mixture. Stir thoroughly to incorporate.
04 - Pour in cold water or sparkling water. Stir until fully combined.
05 - Taste the lemonade and adjust sweetness or acidity as desired by adding more sugar or citrus juice if needed.
06 - Fill serving glasses with ice cubes. Pour lemonade over ice and garnish with blood orange slices, lemon slices, and fresh mint if desired. Serve immediately.