Often recipes only call for a pinch of lemon zest, which can leave you wondering what to do with the leftovers. While you can store the zest in the fridge, the flavor may diminish quickly, so it’s best to use it as soon as possible. That said, the best way to store your lemon zest is in the freezer, as this maintains the flavor for up to 3 weeks. The only downside of storing in the freezer is that the color will likely fade, so if you need to use the zest as a garnish, use fresh lemon zest instead.