Another favorite of Margie's.

Ingredients:
1 cube Sugar
1 dash Bitters
1 tsp. Water
2 oz. Scotch

Instructions:

1. In an old-fashioned glass, muddle Sugar, Water, and Bitters
   
2. Add scotch and stir.
   
3. Add a twist of lemon peel and ice.

If you don't have a muddler (basically a long pestle to grind up sugar in a glass), try using powdered sugar.

Source: Mr. Boston