Hiyajiru (Cold Miso Soup)

I've shared many Japanese dishes from my childhood here, but there are none with as many memories tied to it as Hiyajiru (冷や汁). It's a cold miso soup that's a regional specialty of Miyazaki prefecture on the southern island of Kyushu where I was born. My mom and I moved to the US when I was only a few months old, but I spent many childhood summers visiting my grandparents there.

Summertime in Japan can be oppressively hot and humid; it's the kind of humidity that smacks you in the face like a lukewarm mop and it's why we often spent the predawn hours working outdoors. This was also when ojiichan (grandpa) would take me fishing off a stone outcropping in the local bay and when hi-obaachan (great-grandmother) took me to her fields to harvest the bounties of summer for our first meal. As the sun rose, and with it, the mercury, we'd head back to the shelter of home for breakfast.

My grandparents have all passed, and Kadogawa is no longer quite as rural as it used to be, but this cold miso soup is a favorite that always reminds me of those magical summers. Hiyajiru (冷や汁), which means "chilled soup" in Japanese, is a regional specialty of the Miyazaki region. With chilled crunchy cucumbers in a cold sesame miso soup, it's the kind of breakfast that can get your appetite going on even the most sweltering of days.

Why This Recipe Works

• Salting the cucumbers removes excess water from them through osmosis which transforms their texture from crispy to crunchy. It also prevents the soup from getting watered down. 
• Adding loads of coarsely ground toasted sesame seeds lends a nutty flavor and mild creaminess to the soup, which is an excellent contrast to the fresh cucumbers and herbs. 
• Using dashi for the soup instead of grinding in fish makes this lighter and more refreshing. 

Ingredients for Hiyajiru

• Dashi - Dashi just means "broth" in Japanese, but when it's not proceeded by a qualifier (like chicken or vegetable), it usually refers to a traditional broth made with konbu and katsuobushi. It comes in an instant powdered variety, but I prefer making it from scratch or using dashi packs, which are like tea bags filled with ground konbu and katsuobushi. 
• Toasted Sesame Seeds - You want to use toasted unhulled sesame seeds. They'll be beige to tan in color, and unhulled sesame will be puffy and matte in appearance (hulled sesame tends to look flat and glossy).  
• Miso - I usually use tanshoku miso (淡色味噌) for this, which means "light-colored miso." It's been aged for more time than white miso, but less time than red miso. This gives it a nice earthy taste and robust umami without being overwhelmingly funky. You can read more about different types of miso in my miso soup post. 
• Sugar - There's just enough sugar in the soup to take the harsh edge off of the salty miso without making the soup taste sweet. 
• Cucumbers - If you can find them, Japanese cucumbers are best for this dish, but Persian or Lebanese cucumbers will work, and you can also use English cucumbers (a.k.a. hothouse) after splitting them in half lengthwise and removing their seeds. 
• Garnishes - Hiyajiru is most commonly garnished with green shiso, myoga, and a pinch of shichimi togarashi (Japanese 7 spice). It's also delicious with thin threads of ginger, chopped scallions, or a bit of yuzu kosho. 
• Rice - The cold miso soup can be eaten as is, but it's often poured onto a bowl of rice to eat. I like to rinse the freshly cooked rice in cool water, which removes any excess starch from the surface of the rice while cooling it down. It's important to use reheated or freshly cooked rice, as cold rice from the fridge can be hard and unappetizing. You can also serve Hiyajiru over noodles or tofu. 

How to Make Cold Miso Soup

To prepare the cucumbers, trim one end off and slice them about 1/16th of an inch thick (1.6mm). If you're in a rush, you can cut them thinner, making the salting step go faster, but I like the texture of these slightly thicker slices. If you have a mandoline, this is the fastest way to get consistent pieces, but be careful not to cut your fingers. 

Once the cucumbers are sliced up, toss them with the salt so that each slice of cucumber is coated, and then let them rest for about twenty minutes. This allows the salt to soak into the cucumbers, starting the process of osmosis. 

For the soup, you want to start by coarsely grinding the toasted sesame seeds. I like doing this with a mortar and pestle because it gives you more control over the grind's coarseness, but you can also use a blender, food processor, or spice grinder. 

Next, you want to add the sugar continue grinding the mixture until it resembles damp sand. 

Assuming you're using a mortar and pestle, add the miso and continue grinding until the ingredients are well incorporated. Then you want to add about a quarter of the dashi and mix this together. This step prevents the miso from forming blobs that are hard to dissolve. Once the mixture is nice and smooth, you can add the rest of the dashi and combine. 

If you're using a blender or food processor, you can add the miso and dashi in one step and pulse until the soup is mixed. If you used a spice grinder, dump the sesame mixture into a bowl and whisk in the miso and dashi. 

Keep the soup in the refrigerator until you're ready to serve it. 

For the cucumbers, give them a good massage with your hand to release their excess water. They should be fully translucent when they've released enough water. Then you want to squeeze them with your hands until you can't get any more water out of them.

To assemble the Hiyajiru, break up the clumps of cucumber into a serving bowl and then top with the cold miso soup. Garnish with shiso and myoga to taste. I also like to serve this with a side of shichimi togarashi for sprinkling. 

How to Eat Cold Miso Soup

Hiyajiru is most commonly served along with a bowl of rice. You can eat them separately, but most people chose to spoon the soup and cucumbers over the rice. I usually like to rinse the freshly cooked rice in cold water to chill it and remove excess starch from the surface of the rice. This prevents it from getting gloppy and lukewarm when you mix it with the cold miso soup. 

If you're using day-old rice, I recommend reheating it once before washing it as older rice tends to retrograde, making it hard. By reheating it, you can rehydrate the starches before chilling (which doesn't give it enough time to retrograde). 

Tableware

The turquoise serving bowl and rice bowl, as well as the gold leaf chopstick rest and condiment plate pictured above were sent over by Musubi Kiln. They have a fantastic selection of both classic and modern Japanese ceramics and tableware and they ship around the world. Get 5% off your order by using coupon code “NORECIPES” at checkout.

Other Chilled Japanese Recipes

• Zaru Soba
• Hiyashi Chuka
• Kale & Ramen Salad with Crispy Maitake
• Cold Somen Noodles with Dipping Sauce
• Spicy Sesame Udon
• Hiyayakko (Chilled Tofu)

FAQ

📖 Recipe

Hiyajiru (Cold Miso Soup)

By: Marc Matsumoto

4.34 from 3 votes

Print Pin

Prep Time 30 minutes mins

Total Time 30 minutes mins

Yield 4 servings

Units

Grams + US CupsUS Standard

Ingredients 

1x2x3x

• 400 grams Japanese cucumber (~3 Japanese or ~4 Persian cucumbers)
• ½ teaspoon salt
• 30 grams toasted sesame seeds (~¼ cup)
• 1 tablespoon evaporated cane sugar
• ⅓ cup miso
• 2 cups dashi stock
• 4 servings cooked short-grain rice
• 5 leaves green shiso (optional, finely julienned)
• 1 myoga (optional, sliced thinly)
• Shichimi togarashi (optional)

Instructions

Step PhotosNo Photos

• Slice the cucumbers thinly (about 1/16-inch thick) and toss them with the salt to coat evenly. Let this rest for at least 20 minutes while you prepare the soup.
  
• Add the toasted sesame seed to a mortar and use a pestle to coarsely grind them.
  
• Add the sugar and grind it in with the sesame until the mixture looks like damp sand.
  
• Add the miso and grind this into a paste with the other ingredients.
  
• Add about ¼ of the dashi and combine with the mixture until it's smooth.
  
• Add the remaining dashi and mix together.
  
• You can also do this in a blender or food processor by pulsing the toasted sesame seeds and sugar together before adding the miso and all of the dashi and pulsing until it's free of lumps.
• To serve the Hiyajiru, massage the salted cucumbers until they release a lot of liquid and turn translucent.
• Use your hands to squeeze out as much water from them as you can and transfer them to a serving bowl.
  
• Top with the soup, add a few ice cubes and garnish with the shiso and myoga. Serve with shichimi togarashi for sprinkling to taste.
  
• For the rice, rinse the freshly cooked (or reheated rice) in cold water to chill and remove any excess starch. Then, drain it and serve in rice bowls.
  

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Nutrition Facts

Calories • 138kcalCarbohydrates • 16gProtein • 7gFat • 6gSaturated Fat • 1gPolyunsaturated Fat • 3gMonounsaturated Fat • 2gSodium • 1536mgPotassium • 336mgFiber • 3gSugar • 6gVitamin A • 130IUVitamin C • 3mgCalcium • 139mgIron • 2mg