Although the name may sound intimidating, you don't need to be a bartender to impress your friends. Ezra Star's recipe in How to Drink French Fluently ($12) boasts a short, simple list of ingredients, the star of which is St-Germain, a French bar staple.
From How to Drink French Fluently: A Guide to Joie de Vivre with St-Germain Cocktails by Drew Lazor
Combine all of the ingredients in a mixing glass, add ice, and stir.
Strain into a coupe. Express the lemon peel over the drink and discard.