Note: If you can't get cucumber vodka, you can muddle a small piece of cucumber in the bottom of the shaker and use regular vodka. Strain through a tea strainer to remove particles.
- 1 1/2 ounces Square 1 Cucumber Vodka (see note above)
- 3/4 ounces fresh lime juice
- 3/4 ounces simple syrup
- 1/2 ounce Yellow Chartreuse
- Dash of cranberry bitters
- Soda water
Combine vodka, lime juice, simple syrup, chartreuse, and bitters in a shaker. Fill with ice and shake vigorously for 15 seconds. Strain into an ice-filled Collins glass. Top off with soda water and serve with a long spoon.