Firstly, take a glass jar and sterilize it in a pot of boiling water.
Next, rinse the Yuja fruit thoroughly in running water. You might utilize coarse salt or bi-carb soda to clean the fruit. Using some paper towels, pat dry Yuja fruit.
Now remove the stems. Separate the Yuja rind, pith, seeds, pulp, and juice. Toss out the seeds & pith and make thin slices of Yuja rind (outer layer) in equal shapes & sizes.
Using a blender, combine the Yuja pulp and juice and not the rind.
Take a medium-sized bowl and mix the blended tuna with rock sugar. Now, take the sterilized jar and put the sliced Yuja rind, and then pour over the mixture of Yuja & sugar.
Close the lid of the jar and then let it sit at room temperature so that the sugar can dissolve properly. Depending on the quantity, it might take a couple of days for the sugar to be dissolved properly. Don't forget to stir the Yuja Cheong utilizing a clean teaspoon daily.
Next, place the jar in your refrigerator until you need to use it. The taste of yuna Cheong improves with time. The bitterness goes away in the third week of making it.