Ingredients
For the Kombu Dashi
- 1/2 cup water
- 1 piece kombu
For the Seasonings
- 1 Tbsp mirin
- 1 Tbsp usukuchi (light-colored) soy sauce
For the Spinach
- 1 bunch spinach (8 oz, 227 g)
- 1 pinch Diamond Crystal kosher salt
For the Toppings
- katsuobushi
- toasted white sesame seeds
Instructions
- Gather all the ingredients.
To Make the Kombu Dashi
- In a saucepan, put ½ cup water and 1 piece kombu (dried kelp).
- Slowly bring it to a boil. Once boiling, remove the kombu from the liquid (and reserve it to make Kombu Tsukudani). Now, you have kombu dashi. If you are not vegan/vegetarian, you can add a small amount of katsuobushi for more flavor
To Make the Savory Broth
- To the dashi, add 1 Tbsp mirin and 1 Tbsp usukuchi (light-colored) soy sauce.
- Mix together, bring to a boil, and turn off the heat. Set aside.
To Prepare the Spinach
- Rinse well 1 bunch spinach.
- Bring a large pot of water to a boil. Once boiling, add 1 pinch Diamond Crystal kosher salt. Add the spinach to the boiling water stem side first since the stems take longer to cook.
- After 15 seconds, push down the leafy part into the water and cook for up to 1 minute. (Spinach in the US is more tender than Japanese spinach, so it cooks faster.) Once the spinach is cooked through in roughly less than 1 minute, remove it quickly from the boiling water.
- Transfer to a bowl of iced water and let it cool (but don’t leave the spinach too long, as it will lose nutrients).
- As soon as it‘s cooled, collect the spinach and squeeze out the water. If you like to serve this dish as I do, gather together the spinach neatly by the stems. I like to serve both the stem and leafy parts separately instead of mixing it up together.
- Cut the spinach into 1½-inch (3.75-cm) lengths and squeeze the water out one more time.
To Soak in the Broth
- Put the spinach in an airtight container. Now, pour the savory broth over the spinach.
- Make sure the spinach is evenly distributed in the container and fully submerged in the broth. Put the lid on and let it soak in the refrigerator for at least 1 hour and ideally up to 3–4 hours.
To Serve
- Serve the spinach in small individual bowls and pour some broth on top. I like to make sure each bowl gets both the stem and leafy parts. The dark and light green color contrast makes a beautiful presentation.
- Sprinkle with toasted white sesame seeds for a vegan/vegetarian version. For the standard version, add katsuobushi (dried bonito flakes) on top. Enjoy!

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