To store leftover lemon roasted potatoes, first, allow them to cool down to room temperature. Then, transfer them to an airtight container and place them in the refrigerator. Lemon roasted potatoes will keep well in the fridge for up to 3 days. If you have a larger quantity of lemon roasted potatoes, you can also freeze them for later use. To freeze, let the potatoes cool down completely, then transfer them to a freezer-safe container or zip-top bag. Label and date the container, and place it in the freezer. Frozen lemon roasted potatoes can last up to 2-3 months. When you're ready to reheat your stored lemon roasted potatoes, simply place them in the oven or toaster oven and bake until they are heated through. Alternatively, you can reheat them in the microwave or on the stovetop. Just keep in mind that reheating the potatoes may cause them to lose some of their texture and crispness, so it's best to eat them fresh if possible.