How does the hotel make corn juice?

Better restaurants have freshly squeezed corn juice, which is much more delicious than boxed ones. I have seen the practice of Beitai kitchen and tried it myself, which was very successful. Cut the sweet corn and boil it in water for ten minutes. Just pour them into the blender and stir them. You can also add some lilies without sugar. Note that corn should be sweet corn with sufficient water, not waxy corn.