1. Rinse the lemon. Cleaning fruit is especially important when you plan on eating the peel. Scrub vigorously under hot, soap water with your fingers or a clean sponge.
2. Set your grater tool over a cutting board. Position it as follows:
Flat grater: Hold the handle closest to you, with the end set against the cutting board at a 45º angle. If the flat grater is unstable, grate over a bowl with the grater resting against the edge.
3. Grate the yellow skin only. Grate just enough to get through the yellow skin, avoiding the bitter white pith underneath. Many graters can pierce through this layer in a single movement.
4. Rotate the lemon and repeat. Once the white pith is exposed, rotate the lemon and zest the next strip of peel. Repeat until most of the peel is removed, or until you have enough zest for your recipe.