Slice lemons and place in the bottom of the drink pitcher. Add 1/2 cup fresh mint and 1 cup sugar on top of lemons. With the wooden spoon mash the mixture for 1 minute. Add the berries and lightly mash. Add 1 quart water and refrigerate until chilled.
To serve: Fill a tall glass with ice and fill 3/4 with lemon juice mixture, top with club soda and serve.