This cocktail seems to be quite the mixology hotshot as of late but the Moscow Mule has actually been around for quite some time, 1941 to be exact. Simple to make and a certified crowd-pleaser, you often see this cocktail served in its signature frosty copper mug. The Moscow Mule is perfectly balanced as is, however there's nothing wrong with mixing things up. The sturdy foundation of ginger beer, lime and vodka make it easy to add in some of your favorite flavors like we did with our Citrus Marmalade Mule. Swapping out regular ginger beer for for a diet version makes this a "low-cal" Moscow Mule that packs a punch with out all the calories.