It's a lot easier than you'd think. Follow this simple, 3 ingredient recipe to make a delicious eel sauce to go with your unagi!
Ingredients:
½ cup soy sauce
½ cup white sugar
½ cup mirin (Japanese sweet wine)
Instructions: Heat soy sauce, sugar, and mirin into a small saucepan over medium heat. Cook and stir until liquid is reduced to about 3/4 cup