1. Check the product packaging: check whether the date of production, shelf life, manufacturer, registered trademark and other information is clearly visible, with or without alterations, misspellings and so on.

2. Purchase through official channels: Avoid buying from unofficial channels.

3. Observe the appearance and taste of the product: By observing the color and texture of the sauce, try to see if the taste is consistent with the official standards.

4. Check the anti-counterfeiting code: some regular manufacturers will mark the anti-counterfeiting code on the package, and you can check the authenticity of the code through the official channels of the manufacturers.

I hope the above information is helpful in answering your question.