Store any leftover cooked lamb mince in the fridge in an airtight container for up to 3 days. If you are making this dish with the intention of having leftovers, I recommend you set aside the amount of lamb mince you want to save for later and refrigerate before adding the pomegranate seeds, pine nuts and herbs. This will give you the best and freshest results, but you can refrigerate the final dish and reheat it too. It will still taste really good, but it won't be quite as fresh.