The Porto Tonic is a refreshing cocktail that combines the unique flavors of Porto wine with the crispness of tonic water. It is made by pouring a generous amount of Porto wine over ice and topping it off with tonic water. The result is a light and bubbly drink with a hint of sweetness from the Porto wine. The Porto Tonic is perfect for sipping on a hot summer day or as a pre-dinner aperitif.