Authentic Amaretto Sour

Description
This recipe came from an estate sale. I obtained it when I purchased the family collection from the Fuqua Estate in Richardson, Texas in 1994.
 * Contributed by Catsrecipes Y-Group

Ingredients

 * 1½ ounces amaretto
 * 1 ounce lemon juice
 * 1 teaspoon sugar
 * ice
 * 1 orange slice

Directions

 * 1) Pour ingredients into cocktail shaker with cracked ice.
 * 2) Shake well and strain into sour glass.
 * 3) Garnish with orange slice.