There are pickles in the north. I don't know its scientific name. It's a pimple. Why are some pickles sour?
You said mustard. Generally, no soy sauce, only salt. You have to marinate it for a long time, and then dry it (some are not). As for the acid you said, it may be related to the temperature. Besides, this different person has different tastes. . . Some people say that the dirtier pickles are, the more delicious they are. . . .