Fonseca’s Fine Tawny Porto is made from fruit grown in Fonseca’s estate vineyards supplemented by fruit sourced in the traditional way from area growers. In the winery, the newly developed, robotic “Port Toes” technology for treading allows the winery to maximize the quality of the fruit by mimicking the gentle action of human feet during traditional foot treading. Fermentation is halted by the addition of grape spirits before all the residual sugar has been fermented, creating a sweet, fortified wine. Each year, a portion of this ruby wine is set aside according to its aging potential to be added to Fonseca’s stocks for blending. The Fine Tawny Porto is a blend of wines, selected from these stocks, that have been aged for an average of three years.