Prepare all the ingredients: peel the pineapple and dice it into small cubes. Wash the bell pepper and slice it into thin strips. Grate the ginger.
In a medium saucepan, combine the brown sugar, rice vinegar, ketchup, soy sauce, and water. Stir until the sugar is completely dissolved.
Add the pineapple, bell pepper, and grated ginger to the saucepan. Simmer over low heat for 10 minutes to allow the flavors to meld.
In a small bowl, whisk together the cornstarch with a little cold water until smooth. This will help thicken the sauce.
Pour the cornstarch slurry into the saucepan while stirring constantly to prevent lumps from forming. Continue to cook until the sauce thickens, about 3-5 minutes.
Let the sauce cool slightly, then serve fresh or store in an airtight container in the refrigerator.
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