You can use a fresh peach, nectarine or apricot here. You can also substitute thawed frozen peach slices or 3 ounces peach puree, canned peaches or peach juice if fresh fruit is unavailable. For best results, refrigerate all ingredients beforehand. This is such a refreshing cold drink!
Make the lemonade syrup: In a small saucepan, heat 3/4 cup water over medium heat. Add the sugar and whisk until the sugar dissolves, 1 to 2 minutes. Stir in the lemon zest and juice. Transfer the syrup to a small bowl and set aside to let cool.
Muddle and mix: Place half of the peach in a cocktail shaker and muddle it. Add 4 ounces of the lemonade syrup, the Ketel One and a few ice cubes. Cover the shaker and shake thoroughly to blend.
Serve: Divide the cocktail between 2 glasses with a few ice cubes and the remaining peach slices in each. Top with a splash of club soda. Garnish with the mint or basil. Stir and enjoy!