Ok, so I didn't actually know what I was signing up for. I called a farm nearby and scheduled to harvest grapes today not exactly realizing that these vines were ready about a month ago, maybe longer. I ended up with a lot of shriveled raisins. The grower told me that they can be added to the must to increase the "brix level". Is that true? How do you use late harvest grapes? Was I a victim of a very labor-intensive bad purchase?