Onigiri Bongo Tokyo Recipe: Make It at Home

Onigiri Bongo is a beloved Tokyo-style rice ball shop known for its generously filled, grilled rice balls with a crispy, savory exterior. This recipe recreates that iconic experience at home: perfectly seasoned short-grain rice, a flavorful filling, and a delicious soy-based glaze that caramelizes beautifully when grilled. It’s a satisfying, portable snack or light meal that’s easier to make than you might think.

Ingredients

2 cups (370 g) Japanese short-grain rice (e.g., Koshihikari or sushi rice)
2 1/4 cups (530 ml) water
1/2 tsp salt, plus more for shaping
1/2 cup (75 g) cooked salmon, flaked (or canned salmon, drained)
1 tbsp mayonnaise
1 tsp soy sauce
1/2 tsp sesame oil
1 sheet nori (seaweed), cut into 2-inch strips (optional)
For the glaze:
2 tbsp soy sauce
1 tbsp mirin
1 tsp sugar
1 tsp sesame oil

Instructions

Rinse the rice in a fine-mesh strainer under cold water, swishing with your fingers, until the water runs clear (about 2-3 minutes). Drain well.
Combine the rice and 2 1/4 cups (530 ml) water in a rice cooker or heavy-bottomed pot. If using a pot, bring to a boil over medium heat, then reduce to low, cover, and simmer for 15 minutes. Remove from heat and let stand, covered, for 10 minutes. If using a rice cooker, follow the manufacturer’s instructions.
While the rice cooks, prepare the filling: in a small bowl, mix the flaked salmon, mayonnaise, 1 tsp soy sauce, and 1/2 tsp sesame oil until well combined. Set aside.
In another small bowl, mix the glaze ingredients: 2 tbsp soy sauce, 1 tbsp mirin, 1 tsp sugar, and 1 tsp sesame oil. Stir until the sugar dissolves.
When the rice is done, transfer it to a large bowl (not metal, as it may react). Sprinkle with 1/2 tsp salt and mix gently with a rice paddle or spatula, using a folding motion to avoid mashing the grains. Let the rice cool until it’s cool enough to handle but still warm (about 10 minutes).
Wet your hands with water to prevent sticking, then rub a little salt (about 1/4 tsp total) over your palms.
Take about 1/2 cup (about 90 g) of rice in your hand. Make a small well in the center and place about 1 tablespoon of the salmon filling inside. Gently shape the rice around the filling, pressing lightly to form a compact triangle. The rice should be firm enough to hold together but not squeezed too hard. Repeat with the remaining rice and filling to make 8 onigiri.
Heat a grill pan or non-stick skillet over medium-high heat. Brush the onigiri lightly with the glaze on all sides.
Place the onigiri on the hot pan. Grill for 3-4 minutes per side, until they develop a golden-brown crust and the glaze caramelizes. Brush with more glaze as they cook, if desired.
Remove from heat. If using nori, wrap a strip around the bottom of each onigiri (the nori will crisp up as it sits). Serve hot.

Tips

Rice is key: Use Japanese short-grain rice for the right sticky texture. If you can’t find it, sushi rice is a good substitute; regular long-grain will not hold together well.
Don’t overwork the rice: When shaping, be gentle. Pressing too hard makes the onigiri dense and gummy. The rice should be warm but not hot.
Wet hands are essential: Keep a bowl of water with a pinch of salt nearby. Dip your hands before each onigiri to prevent sticking and lightly season the exterior.
Adjust the glaze: If you don’t have mirin, mix 1 tbsp sake or white wine with 1/2 tsp sugar as a substitute. The flavor will be slightly less sweet.

Serving Suggestions

Serve the grilled onigiri immediately, while the exterior is still crispy and the rice is warm. They pair beautifully with a bowl of miso soup, a simple cucumber salad, or pickled vegetables. For a heartier meal, serve alongside grilled fish or a side of edamame.

Variations

Classic Tuna Mayo: Replace the salmon with 1 can (5 oz/140 g) of tuna (drained) mixed with 2 tbsp mayonnaise and 1 tsp soy sauce.
Vegetarian: Use a filling of sautÃ©ed shiitake mushrooms and spinach seasoned with soy sauce and a pinch of sugar.
Umeboshi (Pickled Plum): Place a small umeboshi (pickled plum) in the center instead of the salmon mixture. This is a tart, traditional version.
No-grill version: Skip the grilling step and serve the onigiri as-is, wrapped in nori. This is the classic picnic style.

Storage and Reheating

Grilled onigiri are best eaten fresh. However, you can store ungrilled (or grilled) onigiri in an airtight container in the refrigerator for up to 2 days. To reheat, wrap in a damp paper towel and microwave for 30-60 seconds, or reheat in a toaster oven at 350Â°F (175Â°C) for 5-7 minutes. The exterior will lose its crispness upon refrigeration, so for best results, re-grill briefly in a hot pan with a little oil.

Frequently Asked Questions

Can I use leftover rice? Yes, but it should be short-grain rice that’s been refrigerated. Reheat it slightly in the microwave (about 1 minute) before shaping, as cold rice won’t stick together well.

My onigiri keeps falling apart. What am I doing wrong? The rice might be too dry or too hot. Make sure you’re using short-grain rice, and that your hands are wet and salted. Also, don’t be afraid to press a little more firmlyâ€”but not too much, or it will be hard.

Can I freeze onigiri? Yes, ungrilled onigiri can be frozen for up to 1 month. Wrap each tightly in plastic wrap and place in a freezer bag. Thaw overnight in the refrigerator, then grill as directed.

What if I don’t have a grill pan? A regular non-stick skillet works perfectly. Just make sure it’s hot enough to sear the rice without sticking.

Is there a way to make this gluten-free? Use tamari or a gluten-free soy sauce instead of regular soy sauce. Check your mirin as well, as some brands contain wheat.

Can I make the filling ahead of time? Yes, the salmon mixture can be made up to 2 days in advance. Store it in an airtight container in the refrigerator.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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