Combine all of the ingredients in a medium saucepan. Bring to a boil over medium heat, stirring regularly.
Reduce the heat to maintain a simmer, and cook, stirring regularly, until the berries have broken down and the mixture has thickened, about 10 minutes. (Note: The sauce will continue to thicken as it cools, so it should still be a little soupy at the end of the cooking time.)
Serve warm, or cool and then transfer the sauce to a jar or airtight container and refrigerate until ready to use. Gently reheat if desired for use on pancakes, waffles, oatmeal, cheesecake, yogurt, etc.