Fonseca 20 Year Old is made from selected red Ports grown in the best vineyards of the Cima Corgo and Douro Superior. The wine ages in small oak casks, generally holding about 630 litres, where there is a relatively small volume of wine compared to the surface area of the vessel, so contact with the wood is proportionately greater.

As it matures in cask, Tawny Port gradually loses the deep red 'ruby' colour of youth and takes on the seductive amber hue known as 'tawny'. At the same time the wine becomes progressively smoother and mellower, its aromas gaining in richness and complexity. Twenty years of ageing has given this wine a wonderfully opulent nutty and spicy flavour.