crème de menthe

Crème de menthe is a sweet mint flavored liqueur, and comes in either a clear or green colored variety. While there can be manufacturing differences between the green and the clear, the two products can be used interchangeably in cocktails except when the resultant color is important or useful.

The following recipes on this site use crème de menthe:

Stinger
brandy, crème de menthe,
Grasshopper
crème de menthe, crème de cacao, cream,