1 ounce rye whiskey
1 ounce Cognac
1 ounce sweet vermouth
1 teaspoon Bénédictine D.O.M.
2 dashes Peychaud's Bitters
2 dashes Angostura Bitters

Mix all ingredients in a double Old Fashioned glass over ice; stir.

From http://gumbopages.com/food/beverages/vieux-carre.html