Simplicity is king in this 2-ingredient espresso drink. Like other classic twofer drinks, think whiskey soda, gin and tonic, rum and coke, the espresso tonic is exactly what it sounds like—a simple combination of espresso and tonic water. This simple combo does what every great twofer drink does—strikes a balance between bitter, sweet and refreshing.Ingredients:Produce:1 OrangeCondiments:1 Simple syrupDrinks:6 oz Tonic waterOther:2 ounces (double shot) freshly brewed espresso