1. Preheat oven to 350 degrees Fahrenheit. In a baking pan, arrange ribs in one layer. In a medium bowl, combine duck sauce, water, teriyaki sauce, garlic, paprika, onion flakes, salt, and pepper. Pour over ribs. Cover tightly with foil; bake for three hours.
2. Let ribs cool; then refrigerate overnight.
3. Preheat oven to 375 degrees Fahrenheit (use the “roast” setting, if available). Remove congealed fat layer from the ribs. Roast, uncovered, spooning sauce over the ribs once or twice, until ribs are braised and glistening, about 20 minutes.
Notes: I like to cool the ribs in the middle of the cooking process so I can remove the fat layer, but it’s not a necessity. You can raise oven temperature, uncover meat, and proceed with the braising part immediately after the three-hour slow roasting.