Have you ever used the onigiri emoji — the little rice ball 🍙? Since emojis originated in Japan, many food icons reflect Japanese cuisine: ramen, mochi, sushi, tempura, oden, matcha, sake, rice crackers and bentos. They’re a playful way to connect with the culture and its food.
Onigiri are simple, portable, and endlessly adaptable — the Japanese answer to a sandwich. These rice balls or triangles are usually filled with ingredients like pickled plum, root vegetables, or fish and often wrapped with a strip of toasted nori seaweed. In Japan you can find them everywhere: convenience stores, small vendors and train stations. Onigiri are designed to be eaten on the go, making them ideal for packed lunches and travel.
On my last day in Japan a host packed me an onigiri made with Japanese yam and kombu broth for a long plane ride. That memorable, comforting snack is what made me fall in love with onigiri — the balance of seasoned rice and a flavorful filling, all easily handheld.
Part of the appeal of onigiri is how easily they accept new flavors. While this recipe features Japanese yam and kabocha squash, feel free to experiment with different cuisines and fillings. A spicy refried bean and cilantro filling could give a Mexican twist, or curried potatoes with peas could make an Indian-inspired version. You can also try Southern-style fillings like seasoned red beans. Onigiri are a blank canvas that welcomes creativity.
Onigiri filled with Japanese Yam and Kabocha Squash
These rice balls combine sticky rice with tender Japanese yam and roasted kabocha. They are lightly seasoned, shaped while warm, and wrapped in nori. Makes about 8 onigiri.
Ingredients
- 2 cups sticky (sushi) rice, rinsed well
- 1/2 cup Japanese yam, diced
- 1/2 cup kabocha squash, diced (skin is edible)
- 1 teaspoon sea salt
- 2 1/2 cups water
- 2 tablespoons black sesame seeds
- 8 strips toasted nori
- 2 tablespoons shiso leaf seasoning (optional)
Instructions
- Combine the rinsed sticky rice, diced Japanese yam and kabocha, sea salt, and water in a pot. Bring to a gentle simmer over medium heat.
- Place a lid on the pot but leave it slightly ajar during the initial simmer. Cook like this for 15 minutes so the steam begins to soften the rice and vegetables.
- After 15 minutes, remove the pot from heat, close the lid fully, and let the rice steam for 10 minutes. This resting time finishes the cooking through gentle steam.
- Stir the black sesame seeds into the rice, then let it cool for another 5–10 minutes until warm but manageable for shaping. The rice should still be moist and sticky.
- Dampen your hands with water to prevent sticking. Scoop roughly 1 cup of rice and shape it quickly into a ball, triangle, or your preferred onigiri form. The rice cools fast, so work briskly.
- Alternatively, place rice on a sheet of plastic wrap, tighten the wrap around the rice, and shape the onigiri using the wrap to form consistent shapes without burning your hands.
- Wrap each shaped rice ball with a strip of toasted nori. Sprinkle shiso leaf seasoning or a little extra salt if desired for added flavor.
- Repeat until all the rice is used. Allow shaped onigiri to cool slightly before storing.
- Store in the refrigerator for up to 2–3 days. Refrigerated rice can become firm; allow onigiri to return to room temperature before eating, or gently reheat to restore softness.
Tips and Variations
- Use short-grain sticky rice for the best texture. Brown rice can be substituted but will yield a different texture and flavor.
- If you like extra seasoning, mix a little more salt into the rice while it’s cooking or sprinkle furikake or dried shiso on the finished onigiri.
- For tidy, uniform shapes, use plastic wrap or an onigiri mold. For rustic shapes, simply form with damp hands.
- Make a variety pack of onigiri with different fillings so each serving offers a new flavor—this is especially useful when packing lunches.
Onigiri are practical, tasty and a great way to bring a little Japanese culinary tradition into everyday meals. Whether you stick with classic fillings or branch out into new flavor combinations, these rice balls make for satisfying, portable bites that travel well and taste best when shared.