Using a sharp knife, peel the grapefruit, lemon and lime, removing the bitter white pith. (foodandwine.com)
The easiest way to zest a lemon is to use a Microplane and move quickly around the lemon to avoid any of the bitter white pith. (thelemonbowl.com)
When you are cutting up the oranges, be sure to remove all of the bitter white pith below the skin and slice the sections between the tough membranes. (mygourmetconnection.com)