Among traditional Japanese food dishes, onigiri are portable rice balls made from seasoned-by-hand Japanese rice and shaped around a filling; this version uses tangy umeboshi, or pickled plum. They are straightforward to make with a pot and damp hands, and the contrast of soft rice, salty-sour filling, and crisp nori makes them satisfying as a snack or light meal.
Ingredients
- 2 cups (360 g) uncooked Japanese short-grain white rice
- 2 cups (480 ml) water, for cooking the rice
- 6 umeboshi (about 60 g total), pitted and cut in half
- 3 sheets nori (about 8 g), each cut into 4 strips
- 1 teaspoon (5 g) fine salt, for seasoning your hands
- ½ cup (120 ml) water, for wetting your hands
- 1 tablespoon (9 g) toasted sesame seeds, optional
Instructions
- Rinse and soak the rice. Put the rice in a bowl and cover it with cool water. Swirl gently with your fingers, pour off the cloudy water, and repeat four or five times, until the water is mostly clear. Drain well, cover the rice with fresh water, and leave it to soak for 20 minutes. This short soak helps the grains cook evenly; do not add vinegar or salt as you would for sushi rice.
- Prepare the filling and nori. While the rice soaks, remove the pits from the umeboshi and cut each plum in half. If the plums are especially wet, blot them lightly so they are easier to handle. Cut the nori sheets into 12 strips. Measure the salt and hand-wetting water and set them beside your work surface.
- Cook the rice. Drain the soaked rice thoroughly and put it in a heavy-bottomed saucepan with the measured 2 cups (480 ml) water. Cover with a tight-fitting lid and bring to a boil over medium-high heat, which usually takes about 3 minutes. As soon as it boils, turn the heat to low and cook, covered, for 12 minutes. Keep the lid on: lifting it lets out steam and can leave the top grains undercooked.
- Let the rice finish steaming. Turn off the heat and leave the covered pot undisturbed for 10 minutes. Then uncover and gently fluff the rice with a rice paddle or broad spoon, lifting from the bottom without mashing the grains. Onigiri should be made while the rice is warm enough to shape but comfortable to handle. If it is steaming hot, wait a few minutes.
- Set up for shaping. Put the warm rice, umeboshi, nori, and sesame seeds, if using, within reach. Wet your hands with a little water and rub a small pinch of salt over your palms. The water helps prevent sticking; the salt lightly seasons the outside. Re-wet your hands between rice balls, but avoid leaving them dripping wet.
- Fill and shape the onigiri. Scoop about ⅓ cup (60 g) cooked rice into one hand and gently flatten it into a thick round. Make a shallow hollow in the center, add half an umeboshi, and cover it with a little more rice. Cup both hands around the rice and press gently into a triangle, turning it a little at a time to make three distinct sides. Use enough pressure for the rice to hold together, but do not squeeze it into a dense block. Repeat with the remaining rice and plum pieces to make 12 onigiri.
- Add the nori and serve. Press a strip of nori around the bottom of each rice ball, or leave the nori on the side for people to wrap on just before eating. If using sesame seeds, sprinkle them over the rice or gently press a few into one side. Serve warm or at room temperature.
Tips
- Choose the right rice. Japanese short-grain rice is sticky enough to hold its shape without becoming a paste. Medium-grain rice can work in a pinch, but long-grain rice usually falls apart. Look for rice labeled Japanese-style or short-grain; sushi rice is also suitable, but do not season it with sushi vinegar for this recipe.
- Adjust for salty plums. Umeboshi vary considerably in saltiness and sourness. Taste a small piece before filling the rice, and use a little less salt on your hands if the plum is very salty. If you cannot find umeboshi, use a small amount of finely chopped takuan (pickled daikon) or another firm, tart Japanese pickle. The flavor will be milder and less sharply sour.
- Keep your hands damp, not wet. Too little water makes the rice cling to your palms; too much makes the outside slippery and harder to shape. A small bowl of water nearby is enough. You can also use clean food-safe gloves, lightly dampened, if you prefer not to handle the rice directly.
- Shape gently and work while the rice is warm. Cold rice is firmer and more likely to crack as you form the triangles. If the rice cools before you finish, cover it with a clean damp cloth while you shape in batches. Avoid packing the rice tightly: compacted onigiri feel heavy and lose the tender texture that makes them pleasant to eat.
Serving Suggestions
Serve onigiri as a quick breakfast, a portable lunch, or part of a Japanese-style meal. For lunch, pair two rice balls with miso soup, sliced cucumber, or a simple salad dressed with sesame and rice vinegar. A bowl of edamame or a few pieces of tamagoyaki (Japanese rolled omelet) can make the meal more substantial. If serving them on a shared platter, keep the nori separate until shortly before eating so it stays crisp rather than absorbing moisture from the rice.
Onigiri are also useful for a picnic or packed lunch because each rice ball is easy to pick up and eat. Pack them in a clean container with space between them so their shapes do not get crushed. If the rice balls will be held for a while, follow the storage guidance below rather than leaving cooked rice out for an extended period. A small dish of pickles alongside the onigiri adds a crisp, bright contrast to the soft rice.
Variations
Kombu onigiri: Replace the umeboshi with about ½ teaspoon (3 g) finely chopped kombu tsukudani per rice ball. This sweet-salty, soy-braised seaweed filling is a classic choice in Japan and gives the center a savory taste. Use a small amount because the seasoning is concentrated.
Sesame and salt: For a simple filling-free version, mix 1 tablespoon (9 g) toasted sesame seeds into the warm rice and shape it with salted hands. Black sesame makes a striking appearance, while white sesame has a gentle toasted flavor. Do not stir vigorously or the warm grains may break.
Shiso and umeboshi: Finely slice 4 shiso leaves (about 8 g) and place a few pieces around the umeboshi filling. Shiso has a fresh, herbal aroma that complements the pickled plum. If fresh shiso is unavailable, leave it out rather than substituting a large amount of a strongly flavored herb.
Seasoned mushroom filling: Finely chop ½ cup (45 g) cooked, cooled shiitake mushrooms and season them lightly with soy sauce. Let the mixture cool before filling so it does not soften or heat the rice unevenly. Keep fillings compact and not too wet; watery centers can make the rice difficult to seal and shape.
Storage and Reheating
Onigiri taste best soon after shaping, especially once the nori is attached. Do not leave cooked rice at room temperature for more than 2 hours. If you are not serving the rice balls promptly, put them in a clean, covered container and refrigerate them within that time. For best texture, eat refrigerated onigiri within 1 to 2 days; plain cooked rice and leftovers are generally kept refrigerated for 3 to 4 days, but the rice in onigiri firms up as it chills.
To reheat, remove the nori first and wrap the rice ball loosely in a damp paper towel. Microwave in short bursts, turning it as needed, until the center reaches 165°F (74°C), the recommended temperature for reheated leftovers. Add fresh nori after warming. You can also freeze individually wrapped onigiri for about 1 month for better quality. Thaw in the refrigerator or microwave from frozen, then reheat to 165°F (74°C); the texture may be softer than freshly made rice.
Frequently Asked Questions
Is onigiri the same as sushi?
No. Onigiri is shaped rice, often with a filling, and is generally made with plain Japanese rice. Sushi rice is seasoned with vinegar, sugar, and salt, and sushi is prepared in different forms. The rice in this recipe is not dressed with vinegar, so it keeps the mild flavor and soft, cohesive texture expected of onigiri.
Can I make onigiri without a rice cooker?
Yes. A lidded, heavy-bottomed saucepan works well, as described here. Keep the lid closed while the rice cooks and steams, and use a low heat once the water reaches a boil. A thin pot can scorch the bottom before the rice is done, so use the heaviest saucepan you have and turn down the burner promptly.
Why are my rice balls falling apart?
The rice may be too cool, the grains may be the wrong type, or the rice may not have been pressed enough to hold its shape. Start with Japanese short-grain rice, shape it while warm, and use several gentle presses to seal the outside. If the surface is very wet, let excess water drain from your hands before picking up the rice.
Can I make onigiri ahead of time?
Yes, but the rice is most tender on the day it is made. Prepare the onigiri a few hours ahead, cover them, and refrigerate them if they will not be served within 2 hours. For the best nori texture, keep the strips separate and add them just before serving. Chilled rice can become firm, so warm it thoroughly before eating if you prefer a softer texture.
Where can I find umeboshi, and what can I use instead?
Umeboshi are Japanese pickled plums, usually sold in jars or pouches at Japanese and other Asian grocery stores. Some are whole and pitted at home; others are already pitted. If you cannot find them, chopped takuan or another firm, tart pickle can fill the center, though it will not have umeboshi’s distinctive sour, salty flavor. Avoid a very wet substitute because excess liquid can loosen the rice.
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