Yes, illegal. According to the query of the official website of the Food Supervision Bureau that ground beef contains protein, fat, carbohydrates, sodium and other ingredients, restaurants can use small amounts, but not more than the dosage, if found to be more than the dosage will be in violation of the laws and regulations, and will face penalties or other forms of punishment. Ground beef is made from high-quality beef, beef fat, using high-temperature and high-pressure cooking process combined with aqueous phase extraction soup in the extraction technology, quenching the flavor, spray drying production of natural seasonings.