What is Clear Soup in Japanese Cuisine?


Clear soup, known as “osuimono” in Japanese, is a fundamental dish in traditional Japanese cuisine. It is a light and delicate soup made by simmering various ingredients to create a clear and flavorful broth. The simplicity and clarity of the soup allow the natural flavors of the ingredients to shine through, making it a popular choice as an appetizer or accompaniment to a meal.

History of Clear Soup

The origins of clear soup in Japanese cuisine can be traced back to the Nara period (710-794) when Buddhism was introduced to Japan. Buddhist monks, who followed a vegetarian diet, developed a method of making clear soups using vegetables, tofu, and seaweed to extract flavors without using meat or fish. Over time, this technique evolved, and clear soup became a staple in Japanese cuisine, known for its simplicity and purity.

Ingredients Used in Clear Soup

Clear soup typically consists of a few key ingredients that contribute to its distinct flavor. Some common ingredients used in clear soup include:

  1. Dashi: Dashi is the base for clear soup and is made from simmering ingredients such as dried bonito flakes, kombu (seaweed), and dried shiitake mushrooms. It provides a subtle umami taste and a rich aroma.
  2. Vegetables: Various vegetables like daikon radish, carrots, mushrooms, and green onions are often added to clear soup to enhance its flavor and add texture.
  3. Tofu: Tofu is a common addition to clear soup, providing a creamy texture and a source of protein.
  4. Seafood or Meat: Clear soup can also include seafood or meat, such as shrimp, clams, chicken, or beef, to add depth of flavor.
  5. Seasonings: Soy sauce, mirin (sweet rice wine), and salt are commonly used to season the clear soup, balancing the flavors and adding a touch of sweetness.

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Preparation of Clear Soup

The process of making clear soup involves several steps to extract flavors and achieve a clear and delicate broth:

  1. Preparing Dashi: Dashi is the crucial base for clear soup. It is made by soaking kombu in water and then simmering it with dried bonito flakes or dried shiitake mushrooms. This process extracts the umami flavors and creates a flavorful broth.
  2. Straining the Broth: After simmering, the dashi is strained to remove any impurities and solid ingredients, resulting in a clear and refined broth.
  3. Addition of Ingredients: Once the clear broth is ready, vegetables, tofu, seafood, or meat are added to the pot and simmered until they are cooked through. This step infuses the broth with additional flavors.
  4. Seasoning: Finally, the soup is seasoned with soy sauce, mirin, and salt to balance the flavors and add depth.

Variations of Clear Soup

While the basic concept of clear soup remains the same, there are various regional and seasonal variations throughout Japan. Some popular variations include:

1. Matsutake Clear Soup

This variation features the prized matsutake mushroom, which is known for its unique aroma and flavor. Matsutake clear soup is often enjoyed during the autumn season when the mushroom is in peak season.

2. Clam Clear Soup

Clam clear soup, or “asari osuimono,” is a popular variation that showcases the sweet and briny flavors of fresh clams. It is often enjoyed during the spring and summer seasons when clams are abundant.

3. Yudofu Clear Soup

Yudofu is a Kyoto specialty that features simmered tofu in a clear soup. The tofu is cooked gently to maintain its delicate texture, and the soup is flavored with soy sauce and kombu dashi.

4. Wakame Clear Soup

Wakame clear soup is a simple and refreshing variation made with wakame seaweed. It is often served as a side dish in traditional Japanese meals.

Health Benefits of Clear Soup

Clear soup offers several health benefits due to its simple and nutritious ingredients:

  1. Low in Calories: Clear soup is a low-calorie option, making it suitable for those watching their weight or following a healthy diet.
  2. Rich in Nutrients: The combination of vegetables, tofu, and seafood or meat in clear soup provides a range of essential nutrients, including vitamins, minerals, and protein.
  3. Hydrating: Clear soup is primarily made of water, making it a hydrating option that can help maintain proper hydration levels.
  4. Ease of Digestion: The light and delicate nature of clear soup makes it easy to digest, making it a suitable choice for those with digestive issues or during times of illness.

Frequently Asked Questions (FAQs)

Q1: Is clear soup vegetarian-friendly?

A1: Clear soup can be vegetarian-friendly if made with a vegetable-based dashi and omitting seafood or meat ingredients. The flavors and richness can still be achieved through the use of vegetables, mushrooms, and seasonings.

Q2: Can I make clear soup without dashi?

A2: While dashi is a crucial component of clear soup, it is possible to make a simplified version using only water and seasonings. However, the depth of flavor provided by dashi may be lacking.

Q3: Can I freeze clear soup?

A3: Clear soup can be frozen, but it is recommended to freeze the broth separately from the solid ingredients. This helps to maintain the texture and quality of the individual components.

Q4: Can I customize the ingredients in clear soup?

A4: Yes, clear soup is highly versatile, and you can customize the ingredients based on your preferences and seasonal availability. You can experiment with different vegetables, tofu varieties, and seafood or meat options.

Q5: How long does it take to make clear soup?

A5: The preparation time for clear soup depends on the specific recipe and ingredients used. On average, it takes around 30 minutes to prepare clear soup, including the time for making dashi and simmering the ingredients.

Q6: Can I use instant dashi for clear soup?

A6: Yes, instant dashi can be used as a convenient alternative to homemade dashi. However, the flavor may differ slightly, and it is recommended to choose high-quality instant dashi for the best results.

Q7: Can I serve clear soup as a main course?

A7: Clear soup is traditionally served as an appetizer or a side dish in Japanese cuisine. However, you can make it more substantial by adding additional ingredients like noodles or rice, turning it into a satisfying main course.


Clear soup, or osuimono, is a beloved dish in Japanese cuisine known for its simplicity and delicate flavors. With its clear and refined broth, it allows the natural flavors of the ingredients to shine through. Whether enjoyed as an appetizer or side dish, clear soup offers a light and refreshing start to a meal, providing both nourishment and culinary satisfaction.

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