Fill a mixing glass with ice cubes. Add all ingredients. Stir and strain into a cocktail glass. Garnish with orange.
Man has cultivated chocolate for at least 3,000 years in South America, but it wasn't just eating -- evidence shows that the Aztecs drank a chocolate beverage called xocolatl (bitter water). Being chocolate lovers they'd probably appreciate the elegance of the Arches of Rome cocktail. We do!