Shake together and serve. (This is primarily a Cuban drink and, granted not easily available.)
2 ounces gin. 2 ounces cream. 1 teaspoon sugar. The white of one egg.
Shake well and pour into a cooler glass which has been filled with crushed ice. A table spoon of any available fruit juice may be added if desired. (Gingeraleds not added to this drink eyen though it is called a cooler, it is really more like a julep.)