You can make your own quick and easy sweet soy sauce mixture by dissolving 1 1/2 teaspoon of sugar with 3 teaspoons of hot water with 1 tablespoon of soy sauce. Another easy way I like to make eel sauce is to mix 1 tablespoon of honey with 1 tablespoon of soy sauce. Alternatively, you can also make a spicy gochujang sauce as well by mixing 1/2 tablespoons of gochujang with 2 1/2 tablespoons of water and 1/2 tablespoon of honey.