The Flying Scotsman is a classic cocktail that was created by Harry Craddock in the 1930s and was first published in his book The Savoy Cocktail Book. The recipe was named for the record-setting train built in 1923 and, according to history books, was even served to the first-class passengers on its many voyages. Though largely a variation of the Rob Roy that is also made with Scotch, fortified wine, and aromatic bitters, it adds more sweet vermouth and mixes simple syrup into the drink to give it much sweeter and less aggressive flavor profile.
Add Scotch, sweet vermouth, simple syrup, and bitters to a mixing glass.
Fill mixing glass with cubed ice.
Using a bar spoon, stir for 30-45 seconds until well-chilled and slightly diluted.
Fill a lowball glass with fresh cracked ice.
Using a Hawthorne strainer, strain into lowball glass.
Express orange twist over top of glass.
Using a zester, zest orange over top of glass.
Garnish with orange twist.