Fill a cocktail shaker halfway with ice cubes. Pour all of the ingredients into the shaker.
Secure the lid and shake vigorously to combine. Strain the cocktail into two, ice-filled collins glasses.
Add a straw to each glass and serve immediately.
Notes
For a deeper shade of teal green, add a few drops of teal gel food coloring.
This drink will also work as a martini, simply strain the cocktail into a chilled martini glass.
For serving a crowd, multiply the ingredients by the amount of guests you would like to serve. Pour into a serving pitcher and serve with ice cubes on the side to avoid watering down cocktails.