Pre-chill a cocktail glass before beginning. In either a mixing glass or cocktail shaker, combine the mint and chocolate liqueurs, then add the cream. Shake with cocktail shaker, then strain into cocktail glass.The Grasshopper may also be served on the rocks in an old-fashioned glass, but this is much less common.If cream is unavailable, milk may be used. Whole milk is preferred; if even that is unavailable, lowfat milk can be corrected by shaking in whipped cream.The standard mint liqueur to use in a Grasshopper is dark Creme de Menthe. The standard chocolate liqueur to use is Creme de Cacao. Others may be substituted while preserving the taste, but the distinctive appearance may be lost.