This simple recipe for Unagi Sauce is a delicious and versatile glaze that used for a number of Japanese dishes, including unagi don and unagi nigiri. It has a sweet and savory flavor that can be drizzled over steamed rice and grilled proteins.
In a small saucepan, mix the soy sauce, mirin, maltose, sugar, and sake (if using).
Place the saucepan over medium heat and continuously stir until the maltose and sugar dissolve. Bring the mixture to a gentle simmer.
Lower the heat and let the sauce simmer for about 8-10 minutes, stirring occasionally, until it thickens slightly. The sauce should coat the back of a spoon.
Remove the sauce from the heat and let it cool completely. It will thicken further as it cools.
Store the sauce in a clean container or jar in the fridge for up to 2 weeks.