Boston Sour

Difford’s Guide
Discerning Drinkers (123 ratings)
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    Boston Sour

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Serve in a Coupe glass

Ingredients:
2 oz Bourbon whiskey
3⁄4 oz Lemon juice (freshly squeezed)
1⁄2 oz Monin Pure Cane Syrup (65.0°brix, equivalent to 2:1 rich syrup)
1⁄2 oz Egg white (pasteurised) or 3 dashes Fee Brothers Fee Foam cocktail foamer or Aquafaba or Vegan egg white alternative
× 1 1 serving
Read about cocktail measures and measuring

How to make:

  1. Select and pre-chill a Coupe glass.
  2. Prepare garnish of lemon zest twist.
  3. SHAKE all ingredients with ice and strain back into shaker.
  4. DRY SHAKE (without ice).
  5. FINE STRAIN into chilled glass.
  6. EXPRESS lemon zest twist over the cocktail and use as garnish.

Allergens:

Recipe contains the following allergens:

  • Egg white (pasteurised) - Eggs

Strength & taste guide:

No alcohol
Medium
Boozy
Strength 7/10
Sweet
Medium
Dry/sour
Sweet to sour 6/10
More cocktails with similar strength and taste profile

Review:

Bourbon whiskey soured with lemon juice and smoothed by egg white.

View readers' comments

History:

Whereas the addition of egg white to a Whiskey Sour is optional, egg white is a requisite in a Boston Sour – a Boston Sour is simply a Whiskey Sour with egg white.
See: Whiskey Sour cocktail History

Nutrition:

One serving of Boston Sour contains 209 calories

Alcohol content:

  • 1.4 standard drinks
  • 17.65% alc./vol. (17.65° proof)
  • 19.9 grams of pure alcohol

Difford’s Guide remains free-to-use thanks to the support of the brands in green above. Values stated for alcohol and calorie content, and number of drinks an ingredient makes should be considered approximate.

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Yossi Burg’s Avatar Yossi Burg
20th June 2024 at 09:13
I made this this evening with Woodford's Reserve (40% ABV here in Australia) - I normally make old fashioned with this as the wood varnish-like qualities shine. However- using in this sour along with aquafaba that same nose is there but with warm butterscotch flavour over other flavours- most surprising, next time I will knock the syrup down to 10ml. Wonderful sour.
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Chris Dimal’s Avatar Chris Dimal
29th April 2023 at 19:36
Beautiful. I actually prefer this over the rocks version. Perfect balance of fluffiness, sourness, and the corn, baking spices and caramel of the Bourbon.
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Wayne Hanley’s Avatar Wayne Hanley
1st March 2023 at 00:09
I used Fee Brothers Fee Foam Cocktail Foamer in place of the egg white. It worked wonderfully. Nice cocktail. It will definitely be revisited.
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John Hinojos’ Avatar John Hinojos
23rd February 2023 at 01:23
Nicely sour. Frothy head does add interesting texture to the cocktail. Subtle tastes of the corn from the bourbon comes through. Excellent any time cocktail.
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