I found this cocktail recipe searching for a drink to serve with an Asian meal. It uses just a dash of fish sauce, and also pomelo juice, which is used often in Vietnamese cooking. Pomelos are like large grapefruits, but slightly sweeter.
Pour the whiskey, Drambuie, lemongrass and pomelo juice into a cocktail shaker with ice and shake until all of the ingredients are chilled. Add the fish sauce and a drop of Worcestershire sauce then strain into a cocktail glass to serve.