Known as a "rimmer" by bartenders, adding a special sweet or salty touch to the top of a glass can make any cocktail even more enjoyable. Some cocktails call for a sugar rimmer -- cosmopolitans, gimlets and sidecars, for example. You can prepare ahead of time by decorating the rims of the cocktail glasses before guests arrive. When the liqueur in the cocktail meets the sugar on the rim, the taste will be sensational.