To prepare a sweet island teriyaki sauce, first you'll need to prepare the ingredients for the sauce. First, you will need the following ingredients: 12 cup (120 mL) sugar, 1 teaspoon (2.5 g) kosher salt, and 2 tablespoons (60 milliliters) water. Heat the sugar and water together over medium heat, stirring constantly, until it is completely dissolved. Next, add the remaining ingredients to the saucepan and stir to combine. Cook the mixture for 2 minutes, then remove the heat from the stove and let it cool for 10 minutes. Then, pour the cooled sauce into jars and store them in an airtight container in the refrigerator for up to 3 months.