Oh! I just thought of another use for really sour kimchi! I'd forgotten the thing that we call Kimchi Bing (a weirdo cross of korean and chinese words meaning something like a kimchi pancake). These would be something like crepes sort of....
I don't have a recipe, just do it by feel - and I wish you luck!:
Ingredients: sour kimchi, eggs (beaten), olive oil, and whole wheat flour (my friend who taught me this actually tended to use rice flour, so the no-gluten folks could do that, maybe with brown rice flour instead of the typical sweet rice flour (?))
directions:
drain the kimchi juice into a bowl. Chop up the vegetables. To the kimchi juice add eggs, oil, and vegetables. Mix in enough flour to generate a batter consistency (if you want to add more flour for a puffier pancake, maybe add some baking soda). Heata skillet and using any sort of fat you want (I usually use either lard or olive oil), fry the batter 'til it's done...
Completely non-specific, sorry, but oh so yummy!