2 cups granulated sugar
1 cup water
2 teaspoons anise extract
1 pint Scotch
Combine sugar and water in a pan and bring to a boil. Boil for 1 minute, then simmer for 30 minutes, stirring occasionally. Cool.
Pour sugar syrup into a sterilized quart-size bottle. Add anise extract and Scotch. Shake gently and cover.
Let mixture age in a dark place for 1 to 2 weeks before using.