Prepare the Simple Syrup:
In a small saucepan, combine sugar and water.
Heat gently until the sugar dissolves completely.
Add cocoa powder if using, and stir until smooth.
Let the syrup cool completely.
Mix the Liqueur:
In a clean glass bottle or jar, pour the vodka or neutral spirit.
Add the cooled syrup.
Add vanilla extract (or scrape in seeds from the vanilla bean).
Add optional spices for additional aroma.
Infuse the Flavors:
