
Crème de menthe green is a sweet, mint-flavoured liqueur — the bright-green coloured version of a product also sold colourless as 'white'.
Cool, penetrating peppermint aroma leads into a markedly sweet, syrupy body with a clean cooling finish.
Poured in small measures as a sweet, flavour-defining modifier, it supplies both cooling mint character and a vivid green hue; because it is heavily sweetened, it is dosed sparingly and stirred or shaken into the build rather than used as a base.
Another mint liqueur can stand in where mint is the point, though the sweetness may need rebalancing with sugar syrup and the green colour reproduced with food colouring — most simply, the colourless white version plus green colouring, since the two are otherwise identical.
White (colourless) crème de menthe
The green and white versions are the same product with the same mint flavour, differing only in colour; the choice between them is aesthetic, driven by the intended colour of the finished drink.
Peppermint schnapps
Crème de menthe is a heavily sweetened 'crème' liqueur, whereas peppermint schnapps is generally a different, often less sweet mint spirit, so the two are not freely interchangeable despite their overlapping mint flavour.
A heavily sweetened 'crème'-style liqueur flavoured with mint, typically peppermint or Corsican mint. It is made by steeping mint (often in grain alcohol, and in some methods distilling the infusion), then filtering and sweetening; the green colour comes either from the mint leaves themselves or, when made from extract, from added colouring, while the flavour matches the white version exactly.