What will soften the bitterness of lemon rind in a chicken soup?

To reduce the bitterness of lemon rind in chicken soup, you can add a pinch of sugar or honey to balance out the sourness. Another option is to blanch the lemon rind in boiling water for a few minutes before adding it to the soup. This will help remove some of the bitterness and leave you with a more subtle citrus flavour.