^Check this article out for 20 uses for leftover fruit and veggie peels.
15. Keep brown sugar soft: If you regularly fall victim to the brick in the pantry known as hardened brown sugar, try adding some lemon peel (with traces of pulp and pith removed) to keep it moist and pliable.
3. Clean your tea kettle: For mineral deposit build up in tea kettles, fill the vessel with water and a handful of lemon peels and bring to a boil. Turn off heat and let sit for an hour, drain and rinse well.