1-Gathering and Blending the Ingredients: First, combine the thawed lemonade concentrate or the fresh lemon juice plus 3/4 cup sugar with the 1/4 cup granulated sugar and the thawed raspberries in an electric blender. Puree until smooth, making sure to remove raspberries from any bag first for easy blending. This step brings out the best of the raspberry taste, creating a syrupy base that’s the heart of the drink.

2-Next, strain the pureed mixture through cheesecloth or a fine-mesh sieve into a bowl. Press firmly to extract as much liquid as possible, then discard the seeds. This might take a minute, but it makes the texture so much better, giving you a smooth syrup without any bits.

3-Mixing and Serving: Just before serving, mix the raspberry lemonade syrup with the entire 2-liter bottle of chilled club soda in a punch bowl, pouring slowly to keep the fizz. Stir gently and add fresh raspberries and lemon slices for a nice touch if you like. For individual servings, fill a tall glass with ice, add 1/3 cup of the syrup, and pour 1 cup of club soda over it slowly.