Grasshopper

A  grasshopper is a sweet, mint-flavored, after-dinner drink. The name of the drink is derived from its green color, which is provided by the  crème de menthe. The drink reputedly originated at Tujague's, a landmark bar in the  French Quarter of  New Orleans,  Louisiana,   and gained popularity during the 1950s and 1960s throughout the American South.

Penny made Raj is first one and he has been drinking them ever since.