Don't have a lemon zester? Here's a quick and easy way to make zest from lemons, limes, oranges etc. Use a potato peeler and "peel" the fruit being careful to peel just the skin, leaving the white pith underneath (you'll get nice, large pieces) then chop the peels on a cutting board.
Sounds strange using a potato peeler doesn't it, but it works! I find it quicker and easier than using my citrus peeler. *smile*