1. Soak prunes in lightly salted water for 1 hour and rinse well under running water.

2. Put them in a pot (one that can be steamed). Pour in all the sugar and salt, mix well and marinate for more than 2 hours.

3. Put the pots together in a steamer (my pots are taller. If you put it on the steam curtain, the lid won't fit, I put the basin directly in the water and it works fine). Cover the pot, bring the pot to a boil, and steam over medium-low heat for 25 minutes.

4. Pour the prunes and juice concentrate into oil- and water-free dry bottles while still hot, cover tightly, and let cool. (Bottling while hot will keep longer, and refrigeration will keep it for more than 10 days, but eat it as soon as you open the lid.

5. If you want to keep it for a long time, you can wait until it cools down before bottling, then put the lid on and boil the bottle in a pot of water for 15 minutes. By this time the bottle has become vacuumed and will keep for a long time. The bottles should be previously used canning jars that won't pop.

6. To drink, take 2~3 prunes with a spoon, then add 2 spoons of juice concentrate and pour it into cold boiled water, purified water or ice water to dilute. Adding some ice cubes will be more refreshing and delicious.