This is the drink that Hemingway made famous, and that can cost you a first mortgage if you order it at the Ritz Carlton in Paris. The Ritz version is made with a champagne Cognac from between 1830-1870.
1 1/2 oz Cognac (or good brandy)
1 oz Cointreau
3/4 fresh lemon juice
Pour all ingredients into cocktail shaker filled with ice. Shake well and strain into stemmed cocktail glass with a sugar-lined rim.