Wikipedia
Saladitos are plums which are dried, salted, which can also be sweetened with sugar and anise or coated in chili and lime. A common misconception is that saladitos and chamoy are the same thing; saladitos are made from dried plums whereas chamoy are made from dried apricots.
Saladitos are considered a candy in Mexico, though they originate from China. In Mandarin, the name for saladitos is Suan-Mei, literally "sour plum." A common method of eating saladitos is to stuff a few of them into an orange or lemon and then suck the salted juice out, while allowing the saladito to rehydrate. Once all the juice is eaten, the saladitos are eaten and the pits discarded. Another method is to eat the saladito without any fruit, and discard the pit, or first rinse the saladito with water, and then eat it plain.
On some occasions, to spice up drinks, a few saladitos are put at the bottom of drinks like Sprite, ginger ale or beer. Once the saladito is placed in the soda, bubbles will begin to rise immediately. In Taiwan, a popular plum drink is made by soaking several saladitos in a pitcher of water until the plum rehydrates and flavors the water.
In Australia Saladitos are known as Salty Plums they come in a variety of different textures. With some being more salty and some being more sweet . In the northern part of Australia, NT , WA and QLD they are very popular. With many of the locals eating these as snack instead of more sugary lollies. Some of the main ingredients are salt, sugar, food colouring and plums.