Using the jigger, measure and pour reposado tequila, St-Germain elderflower liqueur, yellow Chartreuse, and add 1 dash of orange bitters into the shaker.
Secure the lid on the shaker and shake vigorously for about 30 seconds until well-chilled.
Use the Hawthorne strainer to strain the mixture into a chilled cocktail glass.
Garnish with a lemon twist.
Notes
If you prefer a slightly different twist, try adding a dash of honey syrup for added sweetness.