In a cocktail shaker filled with ice, combine rye whiskey, Pimm's, lemon juice and simple syrup.
Shake well and strain into a highball glass filled with fresh ice. Top with ginger ale and add a few dashes of bitters. Stir.
Garnish with lemon wheel and mint sprig.
Notes
* SIMPLE SYRUP 1 cup (8 ounces) water 1 cup granulated sugar Bring the water to a simmer in a saucepan set over medium-high heat. Add the sugar and stir until it completely dissolves. Remove the pan from the heat. Set aside to cool to room temperature. Pour the syrup into a clean 1-pint bottle, cap it and refrigerate it until needed. Makes 1½ cups and keeps two months or longer in the refrigerator.