This actually turned out better than i thought it would. It was very tasty and the meat just fell off the bone, but i would say it was more sweet than sour. as it might be hard to find this specific vinegar i just used rice wine vinegar and as the original vinegar is quite dark i decided to substitute the white sugar for brown sugar to maybe get some color into the dish. it actually worked out quite well with the SUBSTITUTIONS. i served the spare ribs with some steamed rice and some simple stir-fried vegetables. what a delicious and quite simple dish to make. next time i will try with the right vinegar and see if it really does taste that much different.