Lemon powder is made from the peel of a lemon and can be used in place of zest or extract. It is an easy and inexpensive way to make use of discarded lemon peels. Lemon powder can be mixed with sugar to make lemon sugar, with pepper to make lemon pepper or used to flavour tea, cookies or scones. It isn't quite as tangy as zest, but has a slightly sweeter flavour.
Peel the skins off a lemon with a sharp vegetable peeler.
Cut away any white pith remaining on the peels; it is bitter and will affect the flavour.
Arrange the peels skin-side down in a single layer on a plate or baking tray and leave to dry at room temperature for two to three days.
For additional flavour, roast the peels in the oven for five to ten minutes on a low heat.
When lemon peels are completely dried (the edges should be curled up), grind them finely with a mortar and pestle.
Store the lemon powder in a spice jar in the refrigerator.