Your cook time may vary depending on the ripeness of the fruit—the riper the fruit, the shorter the cook time.
Place sugar and in a medium skillet. Add berries and next 2 ingredients, and bring to a boil over medium-high heat, stirring constantly. Boil 1 minute; reduce heat to medium-low, and simmer, stirring often, 7 minutes or until thickened. Stir in butter.