Preheat the oven to 325 degrees F (165 degrees C).

In a saucepan over medium heat, stir together vinegar, ketchup, soy sauce, and pineapple. Stir in brown sugar, cornstarch, salt, and ginger. Cook, stirring constantly, until slightly thickened, about 5 minutes.

Arrange a layer of spareribs in a roasting pan. Pour 1/2 of the sauce over the top. Arrange another layer of spareribs, and top with remaining sauce. Cover pan tightly with foil.

Bake in the preheated oven until tender, about 1 1/2 to 2 hours.