Unadon is a classic Japanese rice bowl that brings together tender grilled eel, hot steamed rice, and a glossy sweet-savory sauce. The name comes from “unagi” for freshwater eel and “donburi” for a rice bowl.

Although it looks like a restaurant-style dish, the home version can be surprisingly straightforward when using prepared grilled eel fillets. This recipe keeps the process simple while preserving the rich flavor and appealing texture that make Unadon so popular.

Ingredients

The home version relies on prepared eel fillets, steamed rice, and a simple sauce made from pantry staples:

- 2 freshwater eel fillets, prepared and defrosted

- 4 cups steamed Japanese short-grain rice

- 1/4 cup soy sauce

- 1/4 cup water

- 2 1/2 tablespoons sugar

- 1 teaspoon cooking oil, for the baking sheet

- Japanese sansho pepper, optional

This makes 4 bowls. Preparation takes about 5 minutes, and the whole dish is ready in about 30 minutes.

Steps

The sauce comes first because it needs time to reduce and cool, then the eel goes under the broiler and the bowls are assembled:

1. Combine the soy sauce, water, and sugar in a small saucepan. Stir over medium heat until the sugar dissolves.

2. Bring the mixture to a gentle simmer, then lower the heat. Cook until the sauce becomes slightly thicker and more concentrated, about 10–15 minutes. Stir occasionally so it does not reduce too far.

3. Remove the sauce from the heat and let it cool slightly. It will thicken as it cools, so if it becomes too thick, stir in a little water.

4. Cut each eel fillet into two or three pieces, depending on the size of the bowls.

5. Preheat the broiler on high. Line a baking sheet with foil and lightly coat it with the cooking oil.

6. Place the eel pieces skin-side down on the sheet. Broil for about 5–7 minutes, until the surface is lightly blistered.

7. Brush the eel with the sauce and broil for another 30–60 seconds, until the sauce bubbles. Watch closely, as the glaze can darken quickly.

8. Spoon hot steamed rice into individual bowls.

9. Brush or drizzle some of the remaining sauce over the rice.

10. Place the eel on top of each serving and add another light coating of sauce.

11. Finish with a small sprinkle of sansho pepper if desired, and serve immediately.

Tips for Better Results

The most important detail is controlling the sauce. It should be thick enough to coat the eel and rice without becoming sticky or overly concentrated. Reducing it gradually over low heat gives better control than boiling it hard.

The eel does not need to be flipped during broiling. Heating it skin-side down and adding the sauce near the end warms the fillet through while giving the glaze a chance to bubble and develop a richer surface.

Without a broiler, the eel can be baked at 425°F (218°C) for around 10–12 minutes, then heated briefly again after the sauce is added. Heating it in a frying pan is another option.

How to Serve Unadon

Unadon is best served immediately while the rice is hot and the eel is freshly glazed. A simple bowl is all that is needed, although a traditional Japanese lacquered box can be used for a more formal presentation. It pairs well with simple side dishes such as miso soup, pickles, or vegetables.

The sauce can be prepared ahead and stored separately, making future servings easier. Leftover eel can also be refrigerated in an airtight container for up to three days, while the sauce can be kept refrigerated for longer when stored properly.

Unadon is a good first dish for anyone new to Japanese home cooking. Look for vacuum-packed grilled eel, often sold frozen in Asian grocery stores, and thaw it in the fridge before cooking. Keep an eye on the broiler during the final glaze, since that last minute decides whether the sauce caramelizes or burns.