This delightful Japanese mustard spinach recipe, also known as komatsuna, is a quick and healthy side dish that brings a burst of flavor to your meal. The combination of soy sauce, sesame oil, and toasted sesame seeds creates a savory and nutty dressing that perfectly complements the tender greens.
Japanese mustard spinach, or komatsuna, might not be a staple in every household. When heading to the supermarket, look for this leafy green in the produce section, often near other Asian greens. If you can't find it, you can substitute with spinach or bok choy for a similar texture and taste.
Ingredients for Japanese Mustard Spinach Recipe
Japanese mustard spinach: A leafy green vegetable known for its mild mustard flavor and tender texture.
Soy sauce: A salty, umami-rich sauce made from fermented soybeans, essential in many Asian dishes.
Sesame oil: A fragrant oil extracted from sesame seeds, adding a nutty aroma and flavor.
Toasted sesame seeds: Seeds that have been lightly toasted to enhance their nutty flavor and add a crunchy texture.
Technique Tip for This Recipe
When blanching japanese mustard spinach, ensure you have a bowl of ice water ready. This will help to quickly stop the cooking process, preserving the vibrant green color and crisp texture. After blanching for 1-2 minutes, immediately transfer the spinach to the ice water. This technique, known as shocking, is essential for maintaining the quality of the vegetable.
Suggested Side Dishes
Alternative Ingredients
japanese mustard spinach - Substitute with baby spinach: Baby spinach has a similar texture and mild flavor, making it a good alternative.
japanese mustard spinach - Substitute with bok choy: Bok choy offers a similar crunch and slightly peppery taste, which can mimic the flavor profile of Japanese mustard spinach.
soy sauce - Substitute with tamari: Tamari is a gluten-free alternative to soy sauce with a similar umami flavor.
soy sauce - Substitute with coconut aminos: Coconut aminos provide a slightly sweeter and less salty flavor, suitable for those avoiding soy.
sesame oil - Substitute with olive oil: Olive oil can be used for its healthy fats, though it lacks the distinct sesame flavor.
sesame oil - Substitute with peanut oil: Peanut oil has a mild flavor and high smoke point, making it a good cooking oil substitute.
toasted sesame seeds - Substitute with toasted sunflower seeds: Toasted sunflower seeds provide a similar crunch and nutty flavor.
toasted sesame seeds - Substitute with chia seeds: Chia seeds offer a similar texture and nutritional benefits, though they have a slightly different flavor.
Other Alternative Recipes Similar to This Dish
How To Store or Freeze This Dish
- Allow the Japanese mustard spinach dish to cool completely before storing. This prevents condensation, which can make the spinach soggy.
- Transfer the cooled spinach to an airtight container. If you plan to store it for more than a day, consider using a glass container to maintain freshness.
- For short-term storage, place the container in the refrigerator. The dish will stay fresh for up to 3 days.
- If you wish to freeze the spinach, first spread it out on a baking sheet lined with parchment paper. This prevents the spinach from clumping together.
- Place the baking sheet in the freezer for about 1-2 hours, or until the spinach is frozen solid.
- Once frozen, transfer the spinach to a freezer-safe bag or container. Label it with the date to keep track of its freshness.
- When ready to use, thaw the spinach in the refrigerator overnight. For a quicker option, you can use the defrost setting on your microwave.
- After thawing, you may need to squeeze out any excess water to maintain the dish's original texture.
- Reheat the spinach gently in a pan over low heat, adding a splash of soy sauce or sesame oil if needed to refresh the flavors.
How To Reheat Leftovers
Stovetop Method:
- Heat a non-stick skillet over medium heat.
- Add a small amount of sesame oil to the skillet.
- Add the leftover Japanese mustard spinach and stir-fry for 1-2 minutes until heated through.
- Serve immediately.
Microwave Method:
- Place the leftover Japanese mustard spinach in a microwave-safe dish.
- Cover with a microwave-safe lid or plastic wrap, leaving a small vent for steam to escape.
- Microwave on medium power for 1-2 minutes, stirring halfway through.
- Check the temperature and heat for an additional 30 seconds if needed.
- Serve immediately.
Steaming Method:
- Set up a steamer basket over a pot of boiling water.
- Place the leftover Japanese mustard spinach in the steamer basket.
- Cover and steam for 2-3 minutes until heated through.
- Serve immediately.
Oven Method:
- Preheat your oven to 350°F (175°C).
- Place the leftover Japanese mustard spinach in an oven-safe dish.
- Cover the dish with aluminum foil to prevent drying out.
- Bake for 10-15 minutes until heated through.
- Serve immediately.
Best Tools for This Recipe
Pot: Used to bring water to a boil for blanching the spinach.
Colander: Essential for draining the blanched spinach.
Bowl: Used for mixing the soy sauce, sesame oil, and toasted sesame seeds.
Mixing spoon: Helps in evenly coating the spinach with the sauce mixture.
Tongs: Useful for handling the hot spinach when transferring it from the pot to the colander.
Measuring spoons: Ensures accurate measurement of soy sauce, sesame oil, and sesame seeds.
Knife: Handy for trimming the ends of the spinach if needed.
Cutting board: Provides a surface to trim the spinach if necessary.
How to Save Time on Making This Recipe
Prep ingredients in advance: Wash and trim the japanese mustard spinach ahead of time to save minutes during cooking.
Use a salad spinner: Quickly dry the blanched spinach using a salad spinner to remove excess water efficiently.
Mix dressing beforehand: Combine soy sauce, sesame oil, and toasted sesame seeds in a bowl before starting to cook.
Chill in ice water: After blanching, immediately transfer the spinach to an ice water bath to cool it quickly and stop the cooking process.
Batch cook: Make a larger quantity and store in the refrigerator for quick side dishes throughout the week.

Japanese Mustard Spinach Recipe
Ingredients
Main Ingredients
- 200 g Japanese mustard spinach (komatsuna)
- 1 tablespoon Soy sauce
- 1 teaspoon Sesame oil
- 1 teaspoon Sesame seeds toasted
Instructions
- Bring a pot of water to a boil.
- Add the Japanese mustard spinach and blanch for 1-2 minutes.
- Drain and cool the spinach under cold running water. Squeeze out excess water.
- In a bowl, mix soy sauce, sesame oil, and toasted sesame seeds.
- Add the spinach to the bowl and toss to coat evenly.
- Serve immediately or chill in the refrigerator before serving.
Nutritional Value
Keywords
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