Crème de menthe (white)
What it is:
Liqueur
Substitution:
Crème de menthe (green)
Further reading:
http://en.wikipedia.org/wiki/Cr%C3%A8me_de_menthe
A sweet, mint-flavored alcoholic beverage with flavor primarily derived from corsican mint. Available commercially in a colorless (called "white") and a green version (which obtains its color from the mint leaves or from the addition of coloring, if extract and not the leaves are used to make the liqueur). Both varieties have similar flavors and are interchangeable in recipes, except where the color is important.