Vin Santo - shelf life after opening?
I have a 0.75 liter bottle I'd like to serve with some cantucci. Assuming we don't finish it off in one sitting, how long will it keep, once the bottle has been opened? Should I pump out the air with a vacu-vin, before storing in the refrigerator?
Vin Santo is already oxidized; that's why it has the flavor it does. It sits usually 10 years in small chestnut barrels, completely undisturbed, before the barrel is opened and the vin santo is bottled. There's a lot of evaporation in the chestnut barrel, so there's plenty of air (oxygen) to slowly degrade the wine and create Vin Santo's distinctive flavor.
The open bottle of Vin Santo will last a long time; after all, oxygen has already done its thing so there's no need to use a vacuum pump or any preservation method. It'll last about a month, I'd say also, unless you decide to drink and enjoy it over several evenings. Cantucci/biscotti is what's traditionally served with it. I love the stuff.
re: maria lorraine
True vin santo sits in the barriques in ambient temperatures and humidities for at LEAST 10 years, the barriques are not completely filled, and then are never topped up. By the time bottling time rolls around, they can be as little as 1/3 full, so a little more oxygen from an opened bottle's ullage is not going to hurt. I bet you could finish the bottle in 2011 and not notice any difference.