To make the pineapple lemon syrup: In a large saucepan over medium heat, combine pineapple juice, lemon juice, sugar and honey. Bring to a boil, and cook for 1 minute. Allow to cool, then refrigerate overnight.
Fill 6 glasses with ice. Place a slice of lemon in each glass. Pour in 2 fluid ounces pineapple lemon syrup. Fill glasses to the top with carbonated water; stir.
