Last year Mitch Tonks and I visited one of our wine producers, Quinta de la Rosa, on the Douro in Portugal with our wine merchant John Hutton. On arrival, we were offered glasses of Sophia Sling-the winery’s house cocktail of white port with Fever-Tree tonic, ice and lemon - named after Sophia Bergqvist who owns the vineyard. I’m not sure when white port last passed my lips - probably as a brief taster before marinating foie gras in it many years ago -but it tasted superb. Both Mitch and I immediately placed orders for white port for our restaurants and I added Sophia Sling to our drinks menu.