Wash plums with lots of water and filter theö Fill a big jar half with water. You can add sugar, salt, vinegar if you like and add the lemon that you've juiced. Mix them all really well. Wash an egg and put it in the water, if it stays on the surface then the amount of salt is perfect. Then put the plums in the jar and add garlics. If you wish, you can add black pepper or coriander seed to give it a taste. Place the celery stalks on top and close the jar really tightly. In 15-20 days, your plum pickles will be ready. Enjoy!