Add syrup or honey. Self-made syrup can transform the citric acid taste, and some syrup or honey can be added to neutralize the sour taste and remove the citric acid taste. Self-made invert syrup needs to be put on the stove and heated over medium heat, so don't stir it any more. After the sugar water is boiled, pour in fresh lemon juice. After boiling again, you need to turn to low heat and cook slowly.