Bitter bamboo shoots themselves are bitter and edible.
The method to remove the bitterness of bamboo shoots: prepare a pot of boiling water, add rice-washing water and bitter bamboo shoots with shells, and simmer for about 10 minutes. Then turn off the fire and soak until it is cool, which can make the bitterness fade. The reason is that rice washing water can lead to the sweetness of bamboo shoots and reduce the bitterness.
Extended data:
Bamboo shoot (English: bamboo shoot) is a young bamboo shoot, also called bamboo shoot. Bamboo is a perennial evergreen herb, and the edible part is primary, tender and fat, short and strong buds or whips. Bamboo originated in China, with many kinds, strong adaptability and wide distribution.
In China, it has been regarded as a "rare dish" since ancient times. Bamboo shoot is a traditional delicacy in China, which has a long history of eating and cultivation. There are some poems in the Book of Songs, such as "adding beans, bamboo shoots and fish" and "what is the sound, only bamboo shoots", which shows that people have been eating bamboo shoots for 2500 to 3000 years.
References:
Baidu encyclopedia-bamboo shoots