According to Wikipedia: Absinthe is a distilled, highly alcoholic (45%-75% ABV), anise-flavored spirit derived from herbs, including the flowers and leaves of the medicinal plant Artemisia absinthium, also called “wormwood.” Absinthe is typically of a natural green color but is also produced in both clear and artificially colored styles. It is often called “the Green Fairy.” Absinthe origin read here Image from Wikipedia.
Here you go: Fill the serving glass with 3/4 of shaved ice 1/2 jigger water (A jigger or measure is a bartending tool used to measure liquor, which is typically then poured into a cocktail shaker.) See here 1/2 jigger Absinthe 2 dashes Angostura bitters (Angostura bitters mainly referred to as angostura, is a concentrated bitters for food and beverages made of herbs and spices.) 1 teaspoonful of Bénédictine ( A brandy or cognac based herbal liqueur beverage produced in France. Its recipe contains 27 plants and spices.)
What you do is strain in a cocktail glass and then serve