The Salty Dog cocktail is a refreshing drink that can be created with either gin or vodka mixed with grapefruit juice, grenadine syrup, and lemon-lime soda. It was invented in the 1960s by Walter Chell to serve at the Polo Lounge of the Beverly Hills Hotel.
It is unclear how it came to be known as "Salty Dog" or what the significance of the name may be. The cocktail originally featured vodka but gin became more popular during Prohibition, making it more likely that "dog" refers to gin rather than salt.
Salt for rimming the glass
¾ ounce freshly squeezed grapefruit juice
1 1/2 ounces Malibu Rum
1. Run the grapefruit wedge around the edge of an old-fashioned glass and dip the glass in salt to rim it.
2. Add ice to the glass.
3. In a shaker with ice, shake the grapefruit juice and Malibu rum until chilled.
4. Strain into the prepared glass.