Preparation method for aged blackonion extract

PURPOSE: A method for manufacturing a functional matured black onion concentrate is provided to enhance polyphenol content and to reduce hot taste and strong smell. CONSTITUTION: A method for manufacturing a functional matured black onion concentrate comprises: a step of washing and cutting onions; a step of sterilizing the cut onions at 85-90°C for 20-24 hours; a step of cooling and drying the onion at 10-15°C and maturing; a step of cooling and drying again at 10-15°C; a step of providing moisture and maturing the onions at 25-60°C and 80-95% of moisture degree; a step of cooling and drying at 10-15°C; a step of adding purified water and performing hot water extraction at 98-103°C; and a step of centrifuging and removing onion debris.