For the most balanced and refreshing result, use freshly squeezed pink grapefruit juice rather than bottled varieties—the natural bitterness and subtle sweetness of ruby red grapefruit complement espresso exceptionally well. To transform this into a true grapefruit cocktail or grapefruit alcoholic beverage, add 30–40 ml of vodka, gin, or blanco tequila before the sparkling water, creating one of the most elegant mixed drinks with grapefruit juice available.
