Onion, also known as bulb onion, onion, jade onion, onion, etc., is a biennial herb of the genus Allium in the family Liliaceae. According to “Lingnan Miscellaneous Notes”, in the 18th century, onions were introduced to Macao from Europe, and then planted in Guangdong. Nowadays, onions are cultivated all over the north and south of our country, and have become a very common and cheap home-cooked dish, which is available in the market all year round. Its meat is crisp and tender, unique in flavor, spicy and sweet, and has high nutritional value. It is known as the “Queen of Vegetables” in some countries and regions, and has good health-care…