1 ds Bitters, Angostura (can be skipped if using carpano)
1 Whole egg
1 oz Nutmeg (fresh for garnish)
Combine everything except garnish in a cocktail shaker and shake, without ice, for at least 10 seconds, until the egg has been suitably smacked around and is mixing well with everything else. Add ice to the shaker and shake again, very hard, for at least 10 seconds. Strain into a chilled wine glass or sour glass and garnish.