crème de menthe
US /ˌkrem də ˈmɑːnt/
UK /ˌkrem də ˈmɑːnt/

1.
a sweet, mint-flavored liqueur, typically green in color, used in cocktails and desserts
:
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She added a splash of crème de menthe to her hot chocolate.
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The cocktail was garnished with a cherry and a hint of crème de menthe.