This recipe can be made sugar-free and low-carb for the best spicy Moscow mule cocktail.  I like to use Bundaberg diet ginger beer so that this becomes a keto-friendly drink.  There are only 4.6 carbs & 148 calories in this low-carb mule recipe.  The classic version with regular ginger beer is 25 carbs & 240 calories.  Either way, this is delish.