You can find the italian recipe on my site http://www.federicoferrazzani.eu/.
Step 1: Ingredients
700 cc of water
40/50 gr of 100% pure liquorice extract
200/250 cc of neutral grain spirit 95%
300 gr of sugar
The liquorice is in the form of small black pieces made only from 100% pure liquorice extract with a bitter and intense taste. When you buy it be sure the only ingredient is liquorice (not sugar or anything else).