01 - 
                In a small saucepan, combine granulated sugar with 1 cup of water. Stir continuously over medium heat until the sugar has fully dissolved. Remove from heat and allow to cool completely.
              
              
              
                02 - 
                In a large pitcher, add the fresh lemon juice, cooled simple syrup, blue raspberry syrup, and the remaining 4 cups of cold water. Stir thoroughly until well blended.
              
              
              
                03 - 
                Incorporate blue food coloring, if using, blending in small increments until the desired blue shade is reached.
              
              
              
                04 - 
                Taste the mixture and adjust by adding extra sugar or water to reach preferred sweetness and tanginess.
              
              
              
                05 - 
                Transfer the pitcher to the refrigerator and chill for at least 30 minutes.
              
              
              
                06 - 
                Pour over ice in individual glasses and garnish with fresh raspberries and lemon slices before serving.