Pills with hearts are not allowed. When the meatballs are heated in the microwave oven, it is necessary to punch a few small holes on the surface of the meatballs. If it is a solid meatball, it can be put in the microwave oven, but if it is a stuffing meatball, it is not recommended to put it in the microwave oven for heating. But when you heat the meatballs, you can put them in a pot to heat them, which will taste better and make them more energetic after heating. Frozen fish balls will do. They are not frozen, but they can be heated by microwaves. I hope my answer is helpful to you. I wish you a happy life. Thank you!