Joaquín Simó riffs on an Old Fashioned, substituting scotch for the more common bourbon. The resulting drink is extremely complex yet surprisingly refreshing. Death and Company, 2007.
Bittermens Hopped Grapefruit Bitters
Stir all the ingredients aside from the twists in an ice filled shaker glass. Strain into a double old fashioned glass over ice. Add orange and grapefruit twists.