1. Preheat oven to 350 degrees Fahrenheit (180 degrees Celsius). Arrange spare ribs in a 9×13-inch (23×33-cm) baking pan.
2. Combine vinegar, brown sugar, soy sauce, and garlic and pour over ribs.
3. Bake, covered, for one hour. Lower heat to 250 degrees Fahrenheit (120 degrees Celsius) and continue to bake until meat is very tender and falling off the bone, about one more hour. Garnish with fresh scallions and serve over parsnip mash.