Add the ingredients to a shaker and fill with ice. Shake well and strain into a chilled cocktail glass or rocks glass filled with fresh ice.
Garnish with a lime wheel. (For a slightly sweeter drink, add a dash of agave syrup—one part water, two parts agave nectar—before shaking) The sugar water syrup is easy enough to make yourself.
Use 1/4 cup of water to 1/4 cup of sugar and heat the mixture on low heat until all the sugar is dissolved.
You can also make a larger batch and store in a sealed container in the fridge for about one month.