The absinthe spoon or grille is used to prepare absinthe in the traditional French method of louching.
To louche an absinthe, pour an ounce of absinthe into your glass and place your absinthe spoon atop the glass and a sugar cube on the spoon.
Slowly pour or drip ice cold water from a fountain or carafe over the sugar cube.
The addition of water dissolves the cube and lowers the alcohol concentration in the glass.
As the alcohol concentration falls, the herbs and botanicals held in the absinthe are released turning the drink milky white forming the louche.
While the louche is forming, you can enjoy the beautiful aroma of the botanicals being released.