I think curries are even more flavorful as leftovers, so you can definitely keep this curry stored in an airtight container in the fridge to enjoy for 3-4 days. You can also freeze lamb curry for up to 3 months. Just portion it intofreezer safe containers or bags for easy storage and defrosting. To reheat, just warm it on the stovetop in a saucepan. If the curry is frozen, just let it defrost in the fridge overnight before reheating.