How to make:
Taking care not to break the egg yolk, PLACE it in the centre of the hollow in the glass. SHAKE the rest of the ingredients with ice and strain over egg. Instruct drinker to down in one.
Like many supposed hangover cures, this works on the kill or cure basis. It tastes slightly better than it looks.
Use another spirit such as vodka in place of cognac.
Recipe adapted from Harry Craddock's 1930 'Savoy Cocktail Book'. This drink is thought to have originally been created in Germany in the 1870s. Jeeves makes something similar for Bertie Wooster in a P.G. Wodehouse tale.