Do you blanch the Chinese toon before cooking?
Generally speaking, it is recommended to blanch Chinese toon before consumption. The detailed explanation is as follows:

Chinese toon contains a certain amount of oxalic acid, and blanching can effectively remove oxalic acid, thereby improving its food safety. Additionally, blanching can help eliminate some nitrates and nitrites from the Chinese toon. These substances may be converted into harmful compounds in the human body, so blanching helps reduce potential health risks. At the same time, blanching enhances the visual appeal of the vegetable by making its color more vibrant and green.
Moreover, Chinese toon contains volatile substances such as toonin, which are the main source of its unique aroma. However, excessive amounts may result in a bitter taste, affecting palatability. Blanching allows some of the toonin to dissolve into the water, reducing bitterness and enhancing flavor. Furthermore, blanching partially cooks the Chinese toon, making it easier to fully cook during subsequent preparation, shortening cooking time, and minimizing nutrient loss due to prolonged cooking.
In daily life, it is advisable to consume Chinese toon in moderation to avoid potential adverse effects from excessive intake.