Miso Yaki Onigiri (Grilled Rice Balls) 味噌焼きおにぎり

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Sweet, savory miso sauce slathered on warm, fluffy rice balls, this Miso Yaki Onigiri is such a simple and humble dish, yet so deliciously comforting.  Perfect for a summer picnic, afternoon snack for your children, or midnight treat for yourself!

A black dish containing miso flavored Yaki Onigiri (Grilled Rice Balls) garnished with shiso leaves.

Miso is one the most versatile condiments that many people outside of Japan may not be familiar with, or at least cook with very often.  In Japan, miso is not only used to make our daily miso soup (with different ingredients, of course), it is also used to marinate various meats and fish, as a base for sauces and dips, and even for pickling vegetables.

I’ve been partnering with Hikari Miso – my favorite miso brand and my go-to ingredient in so many of my Japanese recipes – to encourage you to incorporate this healthy, flavor-packed Japanese essential into your recipes.  Check out my recent miso recipes – Miso Ginger Pork and Vegetable Miso Soup.

A white dish containing miso flavored Yaki Onigiri (Grilled Rice Balls) garnished with shiso leaves.

What’s Yaki Onigiri?

Yaki Onigiri (焼きおにぎり) is grilled rice ball.  Yaki means “grilled” in Japanese (such as TeriyakiYakisoba, Yakiniku, Yakitori, etc), and onigiri means “rice ball.”

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If you have tried Japanese rice balls in the past, but not yaki onigiri, today is the day for you to discover this true Japanese comfort food!

Bold and Flavorful Miso Yaki Onigiri

Onigiri can be served plain, flavored only with salt, and enjoyed with some delicious main dishes such as salted salmon, chicken teriyaki, honey soy chicken or as a part of your bento lunch. It can also be turned into something fun and substantial when you stuff the rice balls with fillings, and eat them as a snack.

Another delicious method to enjoy onigiri is to apply different sauces on top of the onigiri and grill them until crisp, toasty and golden. Called the yaki onigiri, these grilled rice balls are absolutely one of the best savory snacks favored by all Japanese adults and kids alike. Grilling crisps up the rice, creating an irresistible crust on the outside, while the rice stays soft and tender on the inside.

In the past, I’ve shared a Yaki Onigiri recipe where you can use soy sauce or Unagi Sauce (so yummy!). Today I want to introduce miso flavored yaki onigiri.

Yaki Onigiri | Grilled Rice Ball | JustOneCookbook.com

Miso is packed with so much umami that a little goes a long way.  Take note that there are different variations of miso and each brand of miso tastes slightly different from one another. You want to work with the miso you’re using so its salt level and flavor profile suits your preference.

For this recipe, I made the yaki onigiri with shiso leaves (perilla) and sesame seeds.  Shiso gives an amazing fragrance and a refreshing taste that shines through the bold miso flavor.  Sesame seeds add crunchy popping texture within the soft tender steamed rice.  If you can get shiso leaves, that would be great, but if you don’t, I still recommend adding sesame seeds (feel free to skip if you’re not a fan of sesame seeds).

A black dish containing miso flavored Yaki Onigiri (Grilled Rice Balls) garnished with shiso leaves.

Benefits of Miso & Which Miso to Use

Miso, a protein-rich paste made from fermented soybeans, is rich in enzymes due to the fermentation process and it increases the number of probiotics (beneficial bacteria) in the food.  As a result, it enhances the body immune system and has a wide range of health benefits, especially for digestion, absorption, and assimilation of nutrients.

Hikari Miso - Organic Miso Series

I’ve been using Hikari Miso ever since I discovered the brand. Hikari Miso now carries various types of miso that are organic and non-GMO. For this recipe, I’ve used Hikari Miso® Organic Miso – Red Miso, but you can use other types of miso to try out different flavors.  You can purchase Hikari Miso from a majority of Japanese/Asian grocery stores or on Amazon.

Hikari Miso Organic Red Miso | Easy Japanese Recipes at JustOneCookbook.com

Tips to Make Miso Yaki Onigiri

Here are some tips that may be helpful to make Miso Yaki Onigiri.

1. Use the right kind of rice

This applies to making rice balls.  Some of you have asked how to ensure your rice balls stay in shape without the rice falling apart.  If you’re using Japanese short grain rice, this problem should not happen. Medium grain rice should work too, but please use Japanese brand to be sure. Japanese rice is not sticky rice (sticky rice is called glutinous rice, aka mochi rice), but the rice is stickier than other Asian rice varieties.  That’s why Japanese rice naturally sticks to each other and will not fall apart.

2. Use salt for preservation

I’ve been asked several times why we use salt when we make rice balls. There are 2 reasons. First, salt is used as preservation. Back in the day when refrigerators were not in existence, people rub salt on their hands to make rice balls as salt prevents food from spoiling. Then why are we still using salt in the modern days when every home has a refrigerator? That is because rice gets very hard and lose its fluffiness when you store it in the refrigerator.  Therefore, we still keep rice balls at room temperature and use salt to preserve the freshness to this day.

The second reason is for seasoning.  When you eat a lot of plain rice, it can get a little bland and boring.  Back in the day when food was limited in Japan, people use salt as a seasoning for rice balls, and we call these rice balls Shio Musubi (塩むすび) or Shio Onigiri (塩おにぎり).

3. Gentle but firm pressure

Do not squeeze the rice balls when you are shaping them. Just apply gentle but firm pressure on each stroke as you shape.

4. Use parchment paper

For my other Yaki Onigiri recipe, I used my cast iron pan to achieve the nice char on the rice balls.  For this recipe, I attempted a different method because miso gets burnt easily.  I did not want the miso sauce to have direct contact with my pan, so I used a sheet of parchment paper to place it between the pan and the rice balls.  This little trick worked like a charm. Miso did not get stuck and clean up was easy. Just a word of caution: you want to cut the parchment paper smaller than the frying pan so it doesn’t catch fire from the stove’s heat.

5. Watch out, miso burns really fast!

I want to emphasize again that miso gets burnt SUPER fast. Once you brush the rice balls with the miso sauce, you will only need 15 seconds to cook each side over low heat before they achieve a nice brown char. Keep a close eye on them and remove the grilled rice balls immediately once they are done.

With the grilling season upon us, these miso yaki onigiri make a great addition to your Asian or Japanese themed BBQ or potluck party. Any leftovers are great for your next day bento lunch box. For more delicious summer BBQ and potluck recipe ideas, you want to check out this summer BBQ list and also this salad recipe list to go with the yaki onigiri.

A black dish containing miso flavored Yaki Onigiri (Grilled Rice Balls) garnished with shiso leaves.

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Miso Yaki Onigiri

5 from 2 votes

A black dish containing miso flavored Yaki Onigiri (Grilled Rice Balls) garnished with shiso leaves.

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Prep Time

15 mins

Cook Time

15 mins

Total Time

30 mins

Course: Appetizer, Bento, Breakfast, Side Dish, Snack

Keyword: miso, onigiri, rice ball, sesame seed, shiso

Servings: 6 rice balls

Ingredients

  • 2 Tbsp miso (I used Hikari Miso Organic Red Miso)
  • 1 tsp granulated sugar
  • 1 Tbsp mirin
  • 3 cups cooked Japanese short grain rice (I cooked 1.5 rice-cooker-cups (240 ml) uncooked rice *See Notes)
  • 10-12 shiso leaves (Ooba) (divided) (optional)
  • 2 tsp white sesame seeds (roasted/toasted)
  • kosher salt
  • ½ Tbsp neutral flavor oil (vegetable, canola, etc)

Instructions

  1. Gather all the ingredients.

    Miso Yaki Onigiri Ingredients
  2. In a small bowl, combine 2 Tbsp miso, 1 tsp sugar, and 1 Tbsp mirin and mix well. Depending on the type of miso, it might be saltier or sweeter than mine. Adjust the flavor by removing/adding sugar. Set the sauce aside for brushing the rice balls later. 

    Miso Yaki Onigiri 1
  3. For serving the rice ball, keep 6 shiso leaves aside (they will be placed under the rice ball later). Roll up the rest of shiso leaves and cut into julienned strips.

    Miso Yaki Onigiri 2
  4. Add shiso leaves and roasted white sesame seeds in the bowl of steamed rice. Using a rice scooper, fluff up the rice while you mix in shiso leaves and sesame seeds.

    Miso Yaki Onigiri 3
  5. Prepare a small bowl of water and a plate of kosher salt, roughly 2 to 3 tsp. Wet your palms with water, dip your fingers into the salt and rub some of the salt lightly onto your palms. Then using a rice scooper, scoop 1/6 portion of the steamed rice (you should be able to make 6 rice balls).

    Miso Yaki Onigiri 4
  6. Gently form the rice into a ball shape, and then flatten top and bottom. It should look like a thick disk shape.

    Miso Yaki Onigiri 5
  7. Cut the parchment paper to fit the bottom of your frying pan and place it on the pan. Brush the oil on the parchment paper. Place the rice balls and start cooking on medium heat. Make sure to keep some distance between rice balls so they don’t stick to each other.

    Miso Yaki Onigiri 6
  8. Cook the bottom of the rice for about 2.5 minutes. When it’s nicely brown, brush the oil on the top of the rice balls and flip to cook the other side for 2.5 minutes or until nicely brown.

    Miso Yaki Onigiri 7
  9. When both sides are nicely brown, reduce the heat to low heat. Brush/spoon the sauce on top of the rice balls. And flip to cook the miso side for just 10-15 secondsThen flip to brush the sauce on the other side and cook for 10-15 seconds. 

    Miso Yaki Onigiri 8
  10. MISO BURNS QUICKLY. Adjust the heat so miso won’t burn but still has a nice char. You can also use an oven, oven toaster, or broiler but make sure to keep an eye on it.

    Miso Yaki Onigiri 9
  11. Serve each rice ball on a shiso leaf. Enjoy!

    Miso Yaki Onigiri 10

Recipe Notes

Steamed Rice: 1.5 rice cooker cups (240 ml) yields roughly 3 American cups. 

Recipe by Namiko Chen of Just One Cookbook.  All images and content on this site are copyright protected.  Please do not use my images without my permission.  If you’d like to share this recipe on your site, please re-write the recipe in your own words and link to this post as the original source.  Thank you.

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