Imperial Fizz
Imperial Fizz: Blended whiskey, Lemon, Powdered sugar, Carbonated water and White rum. Served in a highball glass.

The Spec
Method
Shake all ingredients (except carbonated water) with ice and strain into a highball glass over two ice cubes. Fill with carbonated water, stir, and serve.
Served in a highball glass.
Spec held as sourced — TheCocktailDB. The house never guesses a drink.
What to pour
Bottles in the cellar for each line of the Imperial Fizz spec:
- White rum — Bacardi Superior, Havana Club 3, Plantation 3 Stars, and 1 more
Drinks that share this spec
Shares Carbonated water, Lemon, Powdered sugar and White rum with Chicago Fizz. If your shelf makes Imperial Fizz, it is already most of the way to these:
Chicago Fizz · Japanese Fizz · Boston Sour · Gin Fizz · Lady Love Fizz · Royal Gin Fizz · Vesuvio · Whiskey Sour