Kahlua
Yields about 5 cups

2 cups water
1 cup brown sugar
1 cup sugar
2 tablespoons instant coffee
3 cups vodka
1 teaspoon vanilla extract
vanilla beans (1 for each bottle)

Heat water and sugars together until dissolved, then stir in coffee and let cool completely. Add vodka and skim off any foam from the top of the liquid, then pour into clean bottles. Split a vanilla bean lengthwise and add to each bottle. Let steep for 30 days, then remove vanilla bean and enjoy.