Ingredients
1/4 cup white rum (optional)
1/2 teaspoon grenadine
1/4 cup plus 2 tablespoons grapefruit soda
1 maraschino cherry, for serving (optional)
Preparation
Combine rum, grenadine, and 1/4 cup soda in a cocktail shaker with ice. Shake until cold. Strain into a martini glass and top with remaining 2 tablespoons soda. Garnish with cherry.
