Oven Roasted Pork With Rhubarb Barbecue Sauce

1 ½ pound fresh rhubarb, trimmed and cut into 3-inch pieces 2 tablespoon olive oil ¼ cup finely chopped onion ½ cup bottled smoky barbecue sauce ½ cup molasses ½ teaspoon salt ½ teaspoon ground ginger ¼ teaspoon ground cloves ⅛ teaspoon ground black pepper ½ cup chopped fresh mango

Frozen Rhubarb

If desired, replace fresh rhubarb with 1 1/2 pounds frozen cut rhubarb. Prepare as directed.