How to Shake a cocktail
This is an essential skill for making cocktails. Shaking has the effect of mixing the ingredients, chilling the ingredients as well as mixing water and air into the mixture.
To shake, you fill the shaker about halfway with ice, then add the ingredients for the cocktail. Now begin shaking the shaker with some vigor. When the outside of the shaker feels cold to the touch, the drink will have been shaken enough.
Now, using a strainer, strain the drink into the serving glass and server promptly.
Watch how to properly shake a cocktail by an expert bartender: