This was my first real introduction to this cocktail. Although I had heard about it throughout my wine education, I had never actually had one. This Porto Tonico was enjoyed by me on the first night that I stayed in Porto on a Dâo Wine Media Tour. A friend and I hit the streets to see the city at night and stopped into Nogueira's for some refreshment. The food looked fantastic though we had already eaten, I did make note of the restaurant for a future trip. The drink is essentially like a gin and tonic but substitutes white Port for the gin with a ratio of 1 part Porto Branco to 2 parts tonic over ice and then garnished with an orange slice or twist and some mint. Very refreshing!