Mixed Drink

Have you ever told a bartender how to make a cocktail?
When it comes to bar or nightclub in the label if you ask a waiter for a drink mixed, and he / she does not know how to do it, give them instructions on how to do? Or for something more?
provided not too busy just tell them how to do it. drink what you want … lol
Rum Mixed Drinks: Part 3 : How to Make the Blonde Moment Mixed Drink