How Is Soy Sauce Made?

0:04 Soy sauce. You've probably drizzled it over rice, dipped sushi in it, or added a splash to your stir fry without giving it much thought. But have you ever wondered how is this dark, salty, umami packed liquid actually made? It's not just salty water with food coloring, I promise. Behind that little bottle is a centuries old process rooted in craftsmanship, patience, and a bit of microbial magic. So, let's break it all down right here on History of Simple Things. Let's start with the basics. Soy sauce

0:49 as we know it today has its roots in ancient China over 2,000 years ago. It evolved from a fermented paste called jang which was originally used to preserve meat, grains, and vegetables. As it spread to other parts of Asia, particularly Japan and Korea, it evolved into the liquid condiment we recognize today. The traditional Japanese version, Sho Yu, and the Chinese Jang Yu, differ slightly in ingredients and taste, but they all share the same foundational process. Fermenting soybeans with grains using mold, yeast, and bacteria. Yes, mold. But don't worry, it's the good kind.

1:37 At its core, soy sauce is made from just a few simple ingredients. soybeans, wheat, salt, water, and a fermentation culture known as cooji. The soybeans are typically steamed until they're soft and pliable. Meanwhile, the wheat is roasted and crushed. The roasting isn't just for show. It enhances the flavor and gives soy sauce its distinct aroma and slightly sweet undertones. When combined, the soybeans and wheat provide the perfect environment for cooji mold to grow. Now, cooji aspergillis or might sound like something out of a lab, but it's been used in Asian cooking for centuries. It's the same culture used in

2:23 making sake and miso. Once introduced to the soy wheat mix, it kicks off a crucial process called enzyatic breakdown. Basically, the mold breaks down proteins into amino acids, including glutamic acid, aka the compound responsible for that addictive umami flavor. It also breaks down starches into sugars, which then feed the next wave of fermentation. Once the cooji mold has worked its magic for a couple of days, the mixture is combined with brine to form what's called moromi, a thick chunky mash that will now be left to ferment. This is where the real transformation happens.

3:10 Traditional soy sauce fermentation can take anywhere from 6 months to over a year. During this time, a symphony of microorganisms, yeast and lactic acid bacteria, join the cooji mold in breaking down the mash even further. The yeast helps produce alcohol and aroma compounds, while lactic acid bacteria lower the pH, creating a stable and flavorful sauce. The Moromi mash is stirred regularly, often in open vats exposed to ambient air, which allows naturally occurring microorganisms to join the party. This long fermentation develops not just the rich color and depth of flavor, but also the smooth mouth feel and slight

3:57 tanginess that set authentic soy sauce apart from fasttrack imitations. After months of fermentation, the moromi is ready for pressing. It's essentially squeezed through clothline presses to separate the liquid from the solid bits. Think of it like juicing a very funky fermented paste. The first pressing yields the highest quality soy sauce, sometimes labeled first draw or nama showyu. The remaining solids can be repressed or repurposed, but they're considered lower grade. The extracted liquid isn't quite finished yet. It still contains proteins, sediments, and various

4:44 compounds that need refining. It's allowed to sit and settle. Some producers may pasteurize it at this stage, not just for food safety, but also to halt fermentation and stabilize flavor. Pasteurization also intensifies the color and aroma through malard reactions. the same browning reaction responsible for the crust on bread and the sear on steak. Not all soy sauces are the same. There's light soy sauce, usukuchi, dark soy sauce, koi cuchi, tamarie, double fermented soy sauce, and even sweetened or flavored versions. The differences mostly come from variations in the wheat to soy ratio, fermentation time, and

5:31 whether extra flavors are added. Light soy sauce is saltier and thinner, used for seasoning without overpowering dishes. Dark soy sauce is thicker and slightly sweet, used more for marinades and rich cooking. Tamarie, on the other hand, is often gluten-free because it uses little to no wheat. It's a byproduct of miso production and tends to be richer and less salty. Commercially, there's also a divide between naturally brewed soy sauce and chemically hydrayed versions. The latter uses acid hydraysis to break down soy proteins quickly. Think of it as the fast food of soy sauces. While cheaper

6:17 and faster to produce, it lacks the depth and nuance of traditionally fermented soy sauce and often contains added caramel color and artificial flavoring. In today's world of efficiency and mass production, not every soy sauce gets to enjoy a leisurely year-long fermentation. Some factory-made versions complete the entire process in a matter of days. By using hydrayed vegetable protein, HVP, salt, corn syrup, and flavor enhancers, these sauces mimic the taste of traditional soy sauce, at least on the surface. They often require colorants and chemical preservatives to approximate the look and shelf stability

7:03 of real soy sauce. That said, many manufacturers still follow traditional brewing methods, especially in Japan, China, and Korea. Some combine both methods, blending naturally brewed soy sauce with HVP to balance cost and quality. So, if you're looking for the real deal, always check the label. If you see ingredients like hydrayzeed soy protein or caramel coloring high on the list, you're probably looking at a shortcut version. So the next time you pour soy sauce into your dipping dish or add a splash to your noodles, remember it's not just a salty condiment. It's the product of

7:51 steamed soybeans, roasted wheat, friendly mold, months of fermentation, and the combined effort of countless invisible microbes. It's a sauce that reflects centuries of culinary tradition and a deep understanding of flavor chemistry. Soy sauce may look simple, but its journey from bean to bottle is anything but. It's a perfect example of how patience, time, and nature can transform the simplest of ingredients into something extraordinary. Thank you for watching. If you have suggestions for our next video, feel free to share them in the comments below. We'll be sure to give you an acknowledgement for your contribution.

8:43 Thank you for joining us on this journey through the history of simple things. Don't forget to like, subscribe, and stay tuned for more stories woven through the smallest details.