Take salted or pickled plums.
If it’s not ready, then you can cook it yourself.
I cooked them the day before – took five plums, cut in half, pierced with a toothpick in several places from the skin, boiled with 70 ml of water, 70 ml of balsamic vinegar with 70 ml of sugar and 1 clove, boiled and poured plums, cooled and brought to a boil again and poured, for the third time, mix and put it in the refrigerator – it turned out very spicy plums.