An online recipe I'll never do again:

Leftover sauerkraut juice with chopped up green onions, as a cold soup (seared dry hot pepper omitted).

It was so salty and strong and onion-y, that a big bowl did use up all the leftover sauerkraut juice, but it also made me sick.

Instead, I think I'll add in juice as a substitute for some water when cooking rice, since that's tastier and w/no apparent negative effects on my stomach, though it does use up a lot less leftover sauerkraut juice.

I also may try to use some juice in homemade salad dressings.