Add crème de menthe, crème de cacao, and fresh cream to a cocktail shaker.
Fill the shaker with ice.
Shake briskly for 10–12 seconds until well chilled and combined.
Double-strain into a chilled cocktail glass.
Garnish with a fresh mint leaf.
The Grasshopper was created around 1918 at Tujague's restaurant in New Orleans by Philip Guichet, and famously came second in a New York cocktail competition. Equal-parts ratios are key - adjust cream last to balance richness without muting the mint.
My Bar Shelf reads your shelf and shows you every cocktail you can make from what you already own, including Grasshopper.