The berachah for raisin wine

Hi,

The blessing for a beverage which consists of water and the juice of cooked raisins is borei pri hagafen, so long as the raisin juice constitutes at least one-sixth of the beverage's volume.

(Rav Moshe Feinstein, Igrot Moshe Yoreh Deah 1:208)

Have a great day,
Mordechai