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Preheat a grill or broiler to high heat. Grill the smoked eel pieces until they are slightly charred and crispy, about 2-3 minutes per side. Alternatively, you can char the eel using a kitchen torch.

In a medium saucepan, combine the grilled smoked eel, light soy sauce, sake, and granulated sugar. Bring the mixture to a simmer over medium heat, whisking continuously to dissolve the sugar.

While the sauce is simmering, prepare the cornstarch slurry: In a small bowl, whisk together the cornstarch and cold water until smooth and no lumps remain.

Once the sauce is simmering and the sugar is dissolved, slowly pour the cornstarch slurry into the saucepan while continuously whisking. Continue to whisk and simmer for 3-5 minutes, or until the sauce thickens to a glossy, syrupy consistency.

Remove the saucepan from the heat. Carefully strain the unagi sauce through a fine-mesh sieve into a clean bowl or jar. Discard the strained eel pieces and any other solids. This will result in a smooth, dark brown glaze.

Allow the unagi sauce to cool completely before storing. It can be stored in an airtight container in the refrigerator for up to 2 weeks.


Preheat a grill or broiler to high heat. Grill the smoked eel pieces until they are slightly charred and crispy, about 2-3 minutes per side. Alternatively, you can char the eel using a kitchen torch.

In a medium saucepan, combine the grilled smoked eel, light soy sauce, sake, and granulated sugar. Bring the mixture to a simmer over medium heat, whisking continuously to dissolve the sugar.

While the sauce is simmering, prepare the cornstarch slurry: In a small bowl, whisk together the cornstarch and cold water until smooth and no lumps remain.

Once the sauce is simmering and the sugar is dissolved, slowly pour the cornstarch slurry into the saucepan while continuously whisking. Continue to whisk and simmer for 3-5 minutes, or until the sauce thickens to a glossy, syrupy consistency.

Remove the saucepan from the heat. Carefully strain the unagi sauce through a fine-mesh sieve into a clean bowl or jar. Discard the strained eel pieces and any other solids. This will result in a smooth, dark brown glaze.

Allow the unagi sauce to cool completely before storing. It can be stored in an airtight container in the refrigerator for up to 2 weeks.
