Ramos Gin Fizz
Instructions
Shake all ingredients except the soda water WITHOUT ICE very vigorously for at least one minute, preferably longer -- the longer the better. Then add ice and shake for 1-2 minutes, as long as you can manage, until extremely cold and frothy. Strain into a tall thin glass, or a very large old fashioned glass, and top with soda water. Stir gently.
Modern variations include adding a few drops of orange bitters to the frothy foam atop the drink, or something even more exotic like a tincture of cardamom. This is not the traditional version, though.