Tasted like Pineau d’Aunis, but it wasn’t…can’t remember the name…..Poulsard?
Friends suggested Greghetto (aka Grechetto) or Aleatico, with smaller amounts of Cigliegiolo, Cannaiolo or Colorino, maybe Sangiovese.
I remember the guy saying it was a blend of red AND white grapes, part of what made it taste so interesting. Still hunting, will update with more info.