Muddle a cucumber slice in mixing glass. Add liquids. Add ice, and stir well. Strain into chilled coupe. Float cucumber wheel on top as garnish.
Served to me by the passionate mixologist Chaim Dauermann at New York's Gin Palace just last night, and I thought it ought to be here. It's the same base ingredients as a Berlioni, but the different quantities and the addition of cucumber and, especially, salt, make for an utterly different experience.
The Hip Hip Gin Gin blog sources this to the Mr. Boston Platinum Guide.