Let’s Talk About Soy Sauce in Setail

May 21, 2026

Table of Content

Soy sauce is the core source of freshness, aroma, and color

Among the seven necessities of life—firewood, rice, oil, salt, soy sauce, vinegar, and tea—soy sauce (primarily referring to soy sauce) is far more than just a condiment for the Chinese. It’s more like the soul of Chinese culinary aesthetics, transcending mere saltiness to become the core source of umami, aroma, and color.

Specifically, its importance is reflected in the following aspects:

· The Soul and Foundation of Chinese Cuisine: Soy sauce lays the foundation for the flavor profile of Chinese dishes. The amber color, savory aroma, and salty freshness of braised dishes all originate from it. Simultaneously, it’s the core of enhancing umami; whether in cold dishes or stir-fries, adding a little can elevate the “umami” of a dish to a new level.

· The Shaper of Regional Flavors: Different soy sauces have created a diverse array of regional cuisines. For example, Cantonese cuisine favors using steamed fish soy sauce and blanched sauce to preserve the original flavor of ingredients; Sichuan cuisine relies heavily on it to create complex flavors in its chili oil and dan dan noodles; and Shanghai cuisine uses it to create its signature rich and dark soy sauce.

A Symbol Carrying Culture and Emotion: In times of scarcity, a spoonful of soy sauce was the simplest delicacy, like rice mixed with lard. The phrase “buying soy sauce” is a shared memory for generations. Even today, for those living away from home, the taste of home is often the dish cooked by mom with soy sauce.

It can be said that salt defines “salty,” while soy sauce defines the “Chinese flavor” of Chinese cuisine. It is both an everyday item on the stove and a link to our emotional memories.

China is a vast country with abundant resources, and its culinary culture is undoubtedly among the best on the planet. Soy sauce, which defines the “Chinese flavor,” exhibits remarkable diversity. Northern and southern soy sauces differ significantly in flavor, color, and brewing process, primarily due to the vastly different climates and resulting dietary habits.

Simply put, northern soy sauce is darker in color and has a saltier, more savory flavor; while southern soy sauce is bright red, sweeter, and has a richer flavor.

🧂 Differences in soy sauce flavor and processing techniques

Characteristic	Northern Chinese Soy Sauce	Southern Chinese Soy Sauce
Flavor Profile	Salty-forward with rich soybean notes, presenting a robust and straightforward taste.	Umami-dominant with a mellow mouthfeel, often featuring a distinct sweet undertone.
Color & Application	Deep, dark hue, primarily used for flavor enhancement and coloring dishes.	Relatively lighter (light soy sauce) or reddish-brown (dark soy sauce), with clearly defined functional uses.
Core Production Process	Low-salt Solid-state Fermentation	High-salt Diluted-state Fermentation
Oil Extraction Method	Soy sauce is obtained by pressing the fermented koji mash after fermentation is complete.	Soy sauce is obtained through multiple extractions (referred to as "drawing") during the fermentation process.

🌍 Reasons for the formation of differences

Climate Dominates Brewing Technology

🔹 Northern Area
Dry & cold, big diurnal temperature variation. Not suitable for long sun fermentation, applying low-salt solid-state indoor fermentation. Sauce is made via pressing extraction after fermentation.

🔹 Southern Area
Hot & humid with abundant sunshine, perfect for microbial growth. Adopts high-salt dilute fermentation. Raw materials are naturally fermented in vats under sunlight for a long period.

Brewing Process: Crafting Unique Flavors

The southern "drawing" technique creates distinct flavor layers:

First Draw: Highest amino nitrogen, the most umami-rich.
Second/Third Draw: Lower freshness, obtained by re-fermenting with new brine.

Blending batches makes light soy sauce (umami-focused, for seasoning). Extended sun concentration + caramel coloring yields dark soy sauce (deep color, for coloring dishes).

Dietary Habits: Refining the Final Taste

🔹 Northern China
Hearty stews and noodles call for salty, aromatic soy sauce, ideal for dipping dumplings or seasoning soups.

🔹 Southern China
Sweet-forward cuisines (Jiangsu/Zhejiang/Shanghai) favor balanced sweet-savory soy sauce, inspired by rice wine brewing, perfect for braising and steaming.

Core logic: Climate shapes craft → craft defines flavor → dietary habits solidify regional styles.

🗺️ The 'hidden map' of southern soy sauce

Three Types of Regional Soy Sauce

🌶️ Sichuan Style Soy Sauce

Rich compound aroma and mushroom freshness. Moderate saltiness and strong sauce scent, suitable for various classic Sichuan savory and spicy dishes.

🍶 Jiangsu-Zhejiang Style Soy Sauce

Salty with mild sweetness. Brewed with sugar or glutinous rice, ideal for braised cuisine to get bright color and mellow taste.

🏞️ Fujian Style Soy Sauce

Ancient natural fermentation with non-GMO soybeans, less additives. Pure original sauce flavor, perfect for original flavor cooking.

💡 Summarize

Different Styles of Regional Soy Sauce

🥢 Cantonese Soy Sauce

Versatile and practical. Clear usage division for seasoning and coloring, rich in umami, builds authentic Cantonese wok flavor.

🌶️ Sichuan-style Soy Sauce

Great at blending rich tastes with natural mushroom freshness, perfect for layered complex flavors.

🍯 Jiangsu-Zhejiang Soy Sauce

Mild salty-sweet flavor, the core soul ingredient for all kinds of braised dishes.

🌿 Fujian-style Soy Sauce

Pure raw materials with original genuine sauce aroma, fit for healthy and natural home cooking.

Choose proper soy sauce according to your cooking needs to make more delicious food.

Brewing process

raw soy saucel

In the soy sauce industry, the commonly mentioned crude oil refers to raw soy sauce. It is well-fermented original sauce liquid that has not undergone heating, sterilization or ingredient blending. Keeping the original pure flavor, it perfectly embodies local features and professional brewing techniques.

Traditional Southern Soy Sauce Brewing Craft

Southern traditional brewing follows natural rules: Spring Koji Making, Summer Sun Fermentation, Autumn Sauce Extraction.

🌱 Spring Koji Making

Mix steamed soybeans and wheat to produce enzyme-rich koji under suitable spring temperature and humidity.

☀️ Summer Sun Fermentation

Ferment koji with brine outdoors. High temperature boosts nutrition decomposition and forms rich savory flavor.

🍂 Autumn Sauce Extraction

Fully fermented mash yields premium raw soy sauce in autumn, retaining pure natural brewed flavor.

Simple Ways to Choose High-Quality Soy Sauce

1. Check label standard: GB/T 18186 pure brewed soy sauce
2. Preferred craft: High-salt liquid-state fermentation
3. Higher amino acid nitrogen = better taste & quality