15 ml Swedish Tonic
40 ml whiskey
20 ml Cointreau (the whiskey sour is great without Cointreau as well)
20 ml sugar syrup
30 ml lemon juice
1/2 egg white
Fill up a short glass with ice.
Add all the ingredients to a shaker and shake well.
Pour it up to the glass.
The whiskey sour was first mentioned in a Wisconsin newspaper in 1870.