You do not need to stir this Tequila Mule Cocktail. You want to preserve as many of the bubbles as you can from the ginger beer. If you would like to make a spicy Mexican Mule Cocktail you can ...

The spicy aftertaste develops after a few sips ... The drink tastes exactly like a margarita from a bar. The muletta -- or tequila mule -- has a strong, dominating aroma of ginger.