Shake well with ice and strain into a chilled martini glass. Flame the orange peel over the glass.
From Harry Craddock's Savoy Cocktail Book, Blue Monday is one of the first vodka drinks to appear in a cocktail book, and that is really the most interesting thing about the drink. It calls for Cointreau and blue vegetable extract. I have taken the liberty of replacing the extract with blue curaçao.