Explain how to make blueberry juice from blueberry juice.
1. Prepare fresh blueberries, a basin of clear water, add appropriate amount of salt, soak blueberries for about five minutes, then pour out the water and rinse them gently with tap water.
2. When cleaning blueberries, be careful not to destroy a layer of white powder on the surface of blueberries, and gently rinse with clear water.
3. Take a clean pot, put a small amount of ice water, and then add a proper amount of rock sugar to boil. After the crystal sugar melts, turn off the fire and let it cool for later use.
4. Take another pot, put the washed blueberries into it, add a proper amount of water, heat them with low fire until they are soft, then turn off the fire and let them cool for later use.
5 Mix the prepared rock sugar water and blueberry juice evenly, and then add a proper amount of lemon juice to mix evenly before drinking. If it is hot in summer, you can put it in the refrigerator for a while before drinking.