I haven't made this but it sure sounds like old fashioned summer goodness. The cook time is chill time.
- In a saucepan combine the sugar with 2 cups water, bring the mixture to a boil over moderately high heat, stirring until the sugar is dissolved, and simmer the syrup, undisturbed, for 10 minutes.
- Let the syrup cool 1 hour in fridge and stir in the pineapple juice, the seltzer, and the lemon juice.
- Pour the mixture into tall glasses filled with ice cubes and garnish the drinks with the lemon slices and the mint sprigs.