This drink is sadly often overlooked in favour of the bourbon-based Whiskey Sour.
Depending on the peatiness of the whisky, I don't tend to add bitters...
The foam from the egg will pass through the fine strainer, but the strainer will catch any curdled egg, and the chalaza and ensure the foam has a light texture.
I think this is my favourite sour. Everything is perfectly balanced with the taste of the Scotch Whisky in the spotlight.
Not sure why, but this did turn out to more foam than the other sours we have mixed.
Definitely a perfect cocktail for any time and any season.
Mine produced more foam with less egg white than my normal whiskey sour. I also agree with other comments (and Simons) that with a Smokey whiskey there is no need for bitters. Finally, with aged liquors (rum, whiskey, brandy, etc) I prefer Peychaud bitters ver anga stour a.
Made it with our cheaper William Lawson's. While it had a strange tang at the start, the egg white still renders it as a luxuriant drink with a nice sour balance.
The whisky sour (with bourbon) has three dashes of Angostura bitters in its recipe. However, David Embury suggests that Peychaud combines better than Angostura with scotch (in his recipe of the Bobby Burns). So, I tried adding three dashes of Peychaud in a Scotch Sour. You should try it too, in my opinion... ;-)
This cocktail is also great without any bitters.