Add egg whites, whisky, Cherry Heering, vermouth and juice into a shaker. Cap and shake—this is known as a dry shake—very carefully. Adding air to the egg white makes both a lovely texture for the drink and a loose meringue, but it can also foam up and nearly blow off the top of your shaker. Have a towel handy and don’t wear your favorite shirt. After a vigorous shake of 20 seconds, carefully remove the shaker lid and add ice. Shake again for 15 seconds—you are both chilling and aerating the drink.