Whereas a traditional G&T is all about icy refreshment, this comforting and exceedingly tasty libation is commonly made by combining gin and tonic syrup (sweeteners optional) in a mug, then ...

In a cocktail shaker filled with ice, combine vodka, simple syrup, lemon juice, tonic syrup, and several basil leaves. Shake vigorously for 15 to 20 seconds. Strain into an ice-filled Collins Glass.