Soak the Fennel seeds for 8 hours and cultivate for 8-10 days till they develop leaves. Rinse well just before use to remove seed hulls.
Crush the bon bons very fine the day before the drink is to be enjoyed. Put all the large pieces in the vodka except for one tablespoon. Shake the bottle some times during the day to ensure the bon bons are dissolved completely. To create your the blue line on the glass lubricate the edge with a bit of honey. Mix the remaining grained bon bons with the sugar and dip the edge into the mix.
Pour the vodka mixture in the glass and mix with Blue Bols, add the sprouts and serve.
Tip To make the drink look more high class you could serve it in cocktail glass.
If you prefer alcohol free drinks, you can mix Sprite soda with a little blue syrup or a tiny drop of blue icing colour and obtain the same beautiful blue - without alcohol.