- ¼ cup soy sauce
- ¼ cup Marsala wine
- 1 teaspoon sugar
- 1 tablespoon rice vinegar
- 1 tablespoon mirin (sweet Japanese cooking wine) or sweet wine
- 2 teaspoons cornstarch
- Bring the soy sauce, Marsala, sugar, rice vinegar, and mirin to a boil in a small saucepan. Simmer 3 minutes.
- Combine the cornstarch with 2 tablespoons of cold water to form a slurry. Thicken the sauce by stirring in the cornstarch slurry, bit by bit, until the sauce has a smooth consistency and coats the back of a spoon.