Petit Manseng isn’t a grape that I know a whole lot about. I know it’s mostly grown in southern France and that it can get very ripe while retaining a lot of acidity — and thus is often made in a sweeter, even dessert, style to balance that acidity. I also know that it’s gaining some traction in the Virginia wine industry. Retaining acidity is always a plus in a region where summers can get very warm. But its thick skins and loose clusters also help in a region that deals with humidity, heavy rain and hurricanes. With high brix levels (and…