Kahlua

3 c sugar

1 c hot water

5 tb instant coffee

1 tb vanilla

13 oz vodka 

Dissolve sugar in water; set to cool. 

Dissolve coffee in ¼ c boiling water. 

Add vanilla. 

Add coffee mixture to syrup mixture. 

Pour in vodka. 

Shake to mix. 

Makes 29 oz.

I find this sweeter than necessary -- after all, it's usually going to be poured over ice and have milk added to it to make a delicious cocktail -- and often cut down the sugar portion by a third.