Estadio and Proof beverage manager Adam Bernbach created this cocktail as a sherry-inflected version of the bourbon Brown Derby. Initially it was not as refreshing as he had hoped, so he added "the cooler element of ice and soda, and then the gin and mint to accentuate the cool and add some herbal notes."
6 fresh mint leaves, divided
2 ounces oloroso sherry
½ ounce honey syrup (2 parts honey dissolved in 1 part hot water)
½ ounce fresh grapefruit juice
¼ ounce gin
In a cocktail shaker muddle 5 mint leaves. Add the sherry, honey syrup, grapefruit juice, gin and ice and shake until chilled. Strain into a chilled Collins glass filled with ice, top with soda water and garnish with the remaining mint leaf. Serve.