The Lisbon Sour is a cocktail inspired by the traditional whiskey sour but with a Portuguese twist. It is made with whiskey, lemon juice, sugar, and a splash of port wine. The addition of port wine gives the cocktail a unique flavor and a touch of sweetness. The Lisbon Sour is a popular choice in many bars and cocktail lounges in Lisbon, and it is a great option for those looking for a taste of local mixology.