In a large pitcher, combine the freshly squeezed lemon juice and honey. Stir until the honey is completely dissolved.
Add the cold water and stir until combined.
Just before serving, pour in the cold club soda and gently stir to combine.
Fill 6 glasses with ice and pour the sparkling lemonade over the ice.
Garnish with lemon slices, if desired.
Serve immediately.
Notes
For a stronger lemon flavor, stir a small amount of fresh lemon zest into the lemonade with the lemon juice.For less carbonation, reduce the amount of club soda and replace it with an equal amount of cold water.Add the club soda just before serving to keep the lemonade fizzy.