I had my first batch of Welches Concord w wine and got pretty drunk off of a cup of it. The problem is that it has a bitter aftertaste. It is not sour. It tastes perfect except it has a shark, bitter finish like arugula, kale, or something like that. I still have more of it left, and I want to drink it without the bitter finish. My process was to get a 64 ounce bottle of grape juice, pour me a cup and a half of it, put a cup and a half of sugar in, wait for that to dissolve, I had a quarter teaspoon per your Blankey, and a quarter teaspoon of yeast nutrient.I then waited for two weeks and wrecked it. Then, I tried to carbonate it by adding some more sugar, but it would not Carmine so I gave up on that. The alcohol content is probably too hot for the yeast to do anything else. So what can I do in future, and what can I do now , amd What can I do my current batch? not