Absinthe is a strong alcoholic liqueur made with an herbal extract including wormwood (Artemisia absinthium). It is an emerald green drink (due to the presence of chlorophyll) which is very bitter (due to the presence of absinthin, which has a bitterness threshold of 1:70,000) and is therefore traditionally diluted with cold water which is poured over a perforated spoonful of sugar into a glass containing a shot of absinthe.