Coffee liqueur is a versatile spirit that can be enjoyed on its own, used in cocktails, or added to desserts. To make homemade coffee liqueur, you will need strong brewed coffee, vodka, sugar, and vanilla extract. Start by combining the coffee and vodka in a jar and letting it infuse for a few weeks. Then, make a simple syrup by boiling water and sugar together and let it cool. Combine the coffee-infused vodka with the simple syrup and add vanilla extract for extra flavor. The result is a smooth and rich coffee liqueur that can be used to make cocktails like White Russian or Espresso Martini.