PURPOSE: To obtain a tasty white burdock excellent in chewiness by boiling a burdock in a solution containing sodium metaphosphate added to an aqueous solution of acetic acid, washing the boiled burdock with water, subsequently placing the washed burdock together with a specific aqueous solution in a bag, hermetically vacuum sealing the burdock, then thermally sterilizing the burdock, cooling and drying the sterilized burdock.

CONSTITUTION: A burdock after washing with water and peeling is boiled in a solution prepared by adding some sodium metaphosphate to an aqueous solution composed of 0.2-0.4% acetic acid and regulating the pH to 2.0-3.5. The boiled burdock is then washed with water to wash off skin or foreign materials, etc. The washed burdock, together with an aqueous solution obtained by adding lactic acid in a volume of 3-5cc based on 1000cc salt water in 1-2% concentration, sodium lactate and sodium metaphosphate thereto and keeping the pH at 2.5-4.0, is placed in a bag, hermetically vacuum sealed, thermally sterilized at 80-90°C for 15-25min, cooled and dried to provide a product.