Travel Trivia Tuesday 7

Jamie and Justin were spot-on with their answers to last week's travel quiz. Nine countries have Portuguese as their official language.Now to this week's question. Port wine is Portugal's most famous product, with a history dating back centuries to the Douro Valley. With a sweet taste it's commonly served with desert. But it is a little-known fact that Port is in fact a British phenomenon.In the 17th and 18th centuries Britain outlawed the import of French wines and looked elsewhere to find a supplier. When merchants travelled to Portugal in search of good quality booze they came across some deep, astringent tastes along the Douro river.In order to stabilize the barrels for shipping home, a special ingredient was added that made a typical red wine into the Port we know and love today. But what is that ingredient? Submit your answers in the comments box below, and I'll reveal the answer next week.