How to zest a lemon and the best way to use it to flavour food

Citrus zest is one of the most powerful and distinctive seasonings you can use, but most people just discard it. To make the most of it, you need to separate the zest from the pith, which together form the citrus peel (also called the rind or the skin). The zest is the colourful part of the peel, the thin layer of yellow, orange or green on a lemon, orange or lime, while the pith is the thicker white layer underneath the zest. The zest has a bright taste and aroma due to the citrus oils it...