1, with blisters: fresh bracken can be soaked in clear water when it is preserved, so the preserved bracken has a higher freshness and will not lose too much nutrients. However, it is best to change the water frequently during the soaking time of the bracken, or you can put the fresh bracken in a dry and humid place and dry it before storing it, so that the bracken can be stored for a little longer.

2. plant ash water: When processing bracken, you can put it in a pot and simmer it with plant ash water for a while, so that the preserved bracken will last longer and the concentration of plant ash water will be lower. Moreover, it is best to simmer with strong fire when cooking, and then turn off the fire and cook for a while before processing.

3. When the bracken is boiled in plant ash water until the leaf surface begins to turn over, it can be taken out and washed in clean water. During the treatment, the water flows together. After treatment, put it aside to drain water, and then put it in a dry and ventilated place to dry.