Bamboo shoot pickled fresh, also known as pickled tuk fresh, originally spread in the rural areas of Jiangnan. After the opening of Shanghai, it also became a delicacy that citizens like to eat.
"Pickled" refers to salted meat or ham, which Shanghainese will marinate in winter for the next spring. "Du" is an onomatopoeic word, which itself has the meaning of thickening and thickening, here it means "slow simmering over low heat"