Koikuchi is a type of soy sauce that originates from Japan. It is known for its dark color and rich flavor, making it a popular choice for various dishes. Koikuchi is made from fermented soybeans, wheat, salt, and water, and it typically has a balanced taste that combines sweetness and umami. This soy sauce is versatile and can be used in marinades, dressings, and as a dipping sauce. It is often used in traditional Japanese cuisine, enhancing the flavors of dishes like sushi, sashimi, and stir-fries. Koikuchi is the most commonly used soy sauce in Japan and is widely available worldwide.