Blueberry-Onion Sauced Pork Tenderloin

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3/4 to 1 pound pork tenderloin

2 tablespoons butter, divided

2 medium onions, sliced

1/2 teaspoon salt

1/4 teaspoon ground black pepper

2 tablespoons sugar

1/4 cup port wine or sweet sherry

2 tablespoons balsamic vinegar

1 cup fresh or frozen blueberries

1 cup chopped cherry tomatoes