Onigiri, or Japanese rice balls, are a delightful and versatile snack that can be enjoyed at any time of the day. These handheld treats are perfect for picnics, lunchboxes, or a quick bite on the go. With a variety of fillings and the savory taste of nori, onigiri offers a delicious way to enjoy Japanese short-grain rice.
Some ingredients in this recipe might not be commonly found in every household. Japanese short-grain rice is essential for the right texture and stickiness. Nori (seaweed) adds a unique flavor and helps hold the rice ball together. Pickled plum (umeboshi) provides a tangy filling that contrasts nicely with the rice. These items can usually be found in the international or Asian section of most supermarkets.

Ingredients For Onigiri Japanese Rice Balls Recipe
Japanese short-grain rice: Essential for the right texture and stickiness.
Water: Used to cook the rice.
Salt: Adds flavor to the rice and helps with shaping.
Nori: Seaweed strips that wrap around the rice balls.
Tuna: Common filling, mixed with mayonnaise for a creamy texture.
Mayonnaise: Mixed with tuna to create a creamy filling.
Pickled plum (umeboshi): A tangy filling that contrasts with the rice.
Technique Tip for Making Onigiri
When forming the onigiri, make sure to wet your hands frequently to prevent the rice from sticking. Additionally, using a light touch while shaping the rice balls will help maintain the fluffy texture of the short-grain rice. If you press too hard, the onigiri may become dense and less enjoyable to eat.
Suggested Side Dishes
Alternative Ingredients
japanese short-grain rice - Substitute with sushi rice: Sushi rice has a similar sticky texture and flavor profile, making it an ideal substitute for Japanese short-grain rice.
water - Substitute with dashi broth: Using dashi broth instead of water can add a subtle umami flavor to the rice, enhancing the overall taste of the onigiri.
salt - Substitute with soy sauce: Soy sauce can add a deeper, more complex salty flavor compared to plain salt.
nori (seaweed) - Substitute with rice paper: Rice paper can be used as a wrap if nori is unavailable, though it will provide a different texture and flavor.
tuna - Substitute with canned salmon: Canned salmon mixed with mayonnaise can provide a similar texture and taste to tuna.
pickled plum (umeboshi) - Substitute with pickled radish (takuan): Pickled radish offers a similar tangy and salty flavor, making it a good alternative to umeboshi.
Alternative Recipes Similar to Onigiri
How to Store or Freeze Onigiri
- Allow the onigiri to cool completely at room temperature before storing. This prevents condensation, which can make the rice soggy.
- Wrap each onigiri individually in plastic wrap to maintain freshness and prevent them from drying out.
- Place the wrapped onigiri in an airtight container to further protect them from moisture and odors in the refrigerator.
- Store the onigiri in the refrigerator for up to 2 days. Beyond this, the texture of the rice may degrade.
- For longer storage, freeze the onigiri by placing the wrapped rice balls in a freezer-safe bag or container. They can be frozen for up to 1 month.
- When ready to eat, thaw the onigiri in the refrigerator overnight or use a microwave. If microwaving, remove the plastic wrap and cover with a damp paper towel to retain moisture.
- Reheat the onigiri in the microwave for about 1-2 minutes, or until warmed through. Be cautious not to overheat, as this can dry out the rice.
- If using fillings like tuna with mayonnaise or pickled plum (umeboshi), be aware that their texture may change slightly after freezing and thawing.
How to Reheat Leftovers
Microwave method:
- Place the onigiri on a microwave-safe plate.
- Cover it with a damp paper towel to prevent it from drying out.
- Heat on medium power for 1-2 minutes, checking halfway through to ensure even heating.
- Let it sit for a minute before enjoying.
Steaming method:
- Set up a steamer with boiling water.
- Place the onigiri in the steamer basket.
- Steam for about 5-7 minutes until heated through.
- Remove carefully and let it cool slightly before eating.
Pan-frying method:
- Heat a non-stick skillet over medium heat and add a small amount of vegetable oil.
- Place the onigiri in the skillet and cook for 2-3 minutes on each side until crispy and heated through.
- Remove from the skillet and let it cool slightly before serving.
Oven method:
- Preheat your oven to 350°F (175°C).
- Wrap each onigiri in aluminum foil to keep it moist.
- Place the wrapped onigiri on a baking sheet.
- Bake for 10-15 minutes until heated through.
- Carefully unwrap and let it cool slightly before enjoying.
Best Tools for Making Onigiri
Rice cooker: A device specifically designed to cook rice to perfection, ensuring it is fluffy and evenly cooked.
Measuring cups: Essential for accurately measuring the rice and water to achieve the correct rice-to-water ratio.
Colander: Used to rinse the rice under cold water until the water runs clear, removing excess starch.
Mixing bowl: Handy for mixing the drained tuna with mayonnaise to create the filling.
Spoon: Useful for scooping the rice and fillings, as well as mixing ingredients.
Cutting board: Provides a clean surface for cutting the nori sheets into strips.
Knife: Necessary for cutting the nori sheets into the desired size for wrapping the rice balls.
Small bowl: Ideal for holding water to wet your hands while shaping the rice balls.
Salt shaker: Convenient for sprinkling salt on your wet hands before handling the rice.
Plate: A flat surface to place the formed rice balls before wrapping them with nori.
Plastic wrap: Optional, but can be used to help shape the rice balls or store them if not eaten immediately.
How to Save Time on Making Onigiri
Prepare the filling: Mix the tuna with mayonnaise and have the umeboshi ready before starting to shape the onigiri.
Use a rice cooker: Cooking short-grain rice in a rice cooker saves time and ensures perfect texture.
Cool the rice: Let the rice cool slightly to make it easier to handle and shape.
Wet hands: Keep a bowl of water nearby to wet your hands frequently, preventing the rice from sticking.
Shape with molds: Use onigiri molds for quick and uniform shapes without much effort.

Onigiri Japanese Rice Balls Recipe
Ingredients
Main Ingredients
- 2 cups Japanese short-grain rice
- 2.5 cups Water
- 1 teaspoon Salt
- 4 sheets Nori (seaweed) cut into strips
Optional Fillings
- 1 can Tuna drained and mixed with mayonnaise
- 2 tablespoon Pickled plum (umeboshi)
Instructions
- 1. Rinse the rice under cold water until the water runs clear.
- 2. Cook the rice in a rice cooker with 2.5 cups of water.
- 3. Once the rice is cooked, let it cool slightly.
- 4. Wet your hands with water and sprinkle with salt.
- 5. Take a handful of rice and form it into a ball or triangle shape.
- 6. Make a small indentation in the center and add your desired filling.
- 7. Cover the filling with more rice and reshape if necessary.
- 8. Wrap a strip of nori around the rice ball.
- 9. Repeat with the remaining rice and fillings.
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