In a medium saucepan heat sugar and water for about 5 minutes until all the sugar is dissolved and it becomes a syrup consistency. Set aside to cool slightly.
Fill a pitcher with ice and pour in the juices, simple syrup and club soda. Slice the lemon and blood orange into rounds and place them in the pitcher. Stir and pour into glass with ice. Garnish with mint.
Recipe courtesy of Danny Boome