In a clean mason jar, sprinkle a thin layer of white sugar. Then put in a single layer of fruit. Alternate between layers of sugar and fruit, finishing the final layer with the sugar. The sugar should totally cover the fruit. In a cheong, the weight of sugar and the weight of the fruit should be at least a 1:1 ratio. I like to put in a bit more sugar if the fruit I am using is watery, such as in this recipe.
Place the lid on the jar, and place the jar in a place away from direct sunlight, at room temperature.
When the top layer of sugar has dissolved, stir the cheong everyday to keep the top moist and prevent mold from forming on top. I also like to smash the berries with a spoon to help them release their juices.
Once all the sugar has dissolved, you may move the cheong into the fridge for long term storage. There is no need to stir daily anymore.
The cheong may undergo alcoholic fermentation. If fizziness or a hissing sound is heard when you open the jar, or the cheong tastes alcoholic-like, move the jar to the fridge to slow down the fermentation.
The cheong tastes better after 1 month or longer, when it has developed a jam like consistency. However, it can be enjoyed at anytime after being made.