Delicacy offers relief from Sichuan's fiery spices

In the back corner of a kitchen in Meishan, Sichuan province, beside a stove hissing with chili oil and popping peppercorns, sits a jar that never makes it onto the menu. Its contents — a colorful mix of greens, reds, yellows and whites — rest submerged in an opaque brine.

The world knows Sichuan for kung pao chicken, mapo tofu, its mouth-numbing hotpot and the mellow depth of doubanjiang (fermented bean paste), but ask any local what binds those bold flavors together, and the answer is likely paocai — pickled vegetables.

It also elevates Sichuan breakfast staples such as noodles, steamed buns and congee, imparting a signature tang to classic dishes such as fish-flavored shredded pork, sour vegetable fish and sour-radish duck soup.

"Sichuan paocai is crisp and not overly salty," said 56-year-old chef Jiang Ming. "The lactic fermentation yields a natural, earthy sourness that vinegar lacks, making it an ideal flavor enhancer."

In Meishan, this tradition has been elevated to an almost architectural scale. At a workshop in the China Paocai City industrial park, nearly 5,000 giant clay jars stand in neat rows, each about 1.6 meters tall.

He Yanping, 49, a provincial-level inheritor of Dongpo paocai-making techniques, presses his ear to a lid as a gentle gurgle escapes from within. "That's the sound of lactic acid bacteria fermenting and releasing gas," he said.

The craft takes its name from Su Dongpo — the celebrated Song Dynasty (960-1279) poet and gourmand who was born in Meishan. The legacy of Su, a passionate maker himself, lent the pickle its enduring cultural identity.

The roots of Chinese pickled vegetables stretch back even further, over 3,000 years in fact, to the pre-Qin period (before 221 BC), when early references to zu, or pickled vegetables, appear in classics such as the Book of Songs and the Rites of Zhou.

This deep historical lineage found its way into local customs. By the Qing Dynasty (1644-1911), a jar of paocai had become an essential part of a bride's dowry — a portable legacy of flavor carried into married life.

Traditional Dongpo paocai is made in a large earthenware jar. Fresh vegetables are packed inside and fully submerged in the "mother brine", or laomu shui — a living culture passed down through generations. The lid is sealed with a water lock, allowing gases to escape while keeping oxygen out. What follows is daily care and patient waiting.

"The secret lies in the mother brine, teeming with the specific strains of lactic acid bacteria that give Dongpo paocai its distinctive flavor," He said.

To outsiders, pickled vegetables may call to mind kimchi or sauerkraut, but Sichuan paocai is different. Radishes, carrots, cabbage, long beans, young ginger, red Sichuan chili peppers and bamboo shoots are packed whole or in chunks into a seasoned brine of water, salt, Sichuan peppercorns and other spices, often with a bit of baijiu.

Within hours or a day or two at most, they emerge with a clean, crisp sourness and a subtle fragrance.

"This water-based fermentation method sets Dongpo paocai apart from most other pickling methods in China or abroad," He said. "The credit goes to the Sichuan Basin's mild climate — free from freezing winters and scorching summers — which keeps the lactic acid bacteria active year-round."

Another defining feature is the brief fermentation period — sometimes just hours — which yields a lower-salt product with a distinctly crisp texture.

What began as a local craft is evolving into a global curiosity, with a growing number of foreign visitors flocking to the China Paocai City industrial park to master the craft.

Among them is Hajar Wassila, a Moroccan student who joined a DIY session at the workshop of Sichuan Laotanzi Food Co. Guided by instructors, she packed her jar with vegetables, garlic, red Sichuan chili peppers and carrots, pressing them firmly beneath the brine.

"When I smell it, I want to taste it immediately," she said, holding up the jar with a grin. "I love pickles and tried to make them before, but failed. Now I've finally got the secret."

At the Sichuan Dongpo Chinese Paocai Industrial Technology Research Institute, more than 11,000 microbial strains are preserved, supporting local enterprises in developing new products and refining quality, according to Wang Dongdong, deputy director of the institute.

"By screening superior strains and developing advanced production technologies, we have reduced salt content, enhanced flavor and accelerated fermentation, while ensuring consistently stable quality," Wang said.

"We are also researching the use of specific strains to develop pickles with the potential to help lower blood sugar and lipid levels," he added.