The primary ingredient in soy sauce is fermented soybeans. Soy sauce is a traditional condiment originating from China and is commonly used in Asian cuisines. The fermentation process involves soaking the soybeans, cooking them, and then combining them with a specific mold, yeast, and bacteria to initiate fermentation. This process can take months, resulting in a rich flavor that enhances various dishes. Soy sauce not only adds umami to food but also provides a source of protein, although its high sodium content should be considered when using it in cooking.