Boston Sour

The Boston Sour is just a Whiskey Sour with egg white added – but oh, what a difference an egg makes! The texture is velvety-smooth, and the foam from the egg white carries the beautiful scents of lemon and bourbon (or rye or blended whiskey, if you prefer).

We like to use a technique called “dry-shaking” when we make drinks with egg white. To dry-shake, add all your ingredients to a shaker without ice, and shake vigorously for ten seconds or so. Then open your shaker, add ice, and shake again. The dry shake helps the egg to build up airy volume before the ice and cold water have a chance to water it down.

We always double-strain egg drinks: once through the shaker’s strainer, and then straight through a fine wire-mesh strainer into the serving glass. This ensures that no unwanted eggy solids make it into the drink.

Ingredients

Instructions

Combine all ingredients in a shaker without ice, and give it a vigorous shake. Add ice, shake again, and double-strain into a chilled cocktail or coupe glass, or a short ice-filled glass.

Get the App

The Cocktail Party app puts this drink – and hundreds more – in your pocket, and tells you what you can make from the ingredients you have at home. It's the best $3.99 you'll ever spend on a drink.

Really Good App

We downloaded the app after seeing it as one of the top posts on /r/cocktails, and we've been playing around with it and adding our ingredients to the list. While it's not an all inclusive list of ingredients (missing some creme de ), it's a solid overall app and tosses out some truly spectacular recipes based on what you have in your liquor cabinet. Minor quibbles for an otherwise fantastic application!
US JCorduroy, iTunes App Store